diff --git a/.github/workflows/apps_version_check.yaml b/.github/workflows/apps_version_check.yaml
index a86b06967..ff757d47d 100644
--- a/.github/workflows/apps_version_check.yaml
+++ b/.github/workflows/apps_version_check.yaml
@@ -22,9 +22,15 @@ jobs:
       - name: fix-git-unsafe-repository
         run: git config --global --add safe.directory /__w/emqx/emqx
       - name: Check relup version DB
+        if: endsWith(github.repository, 'emqx')
         run: |
           PKG_VSN=$(./pkg-vsn.sh)
           ./scripts/relup-base-vsns.escript check-vsn-db $PKG_VSN ./data/relup-paths.eterm
+      - name: Check relup version DB (ee)
+        if: endsWith(github.repository, 'enterprise')
+        run: |
+          PKG_VSN=$(./pkg-vsn.sh)
+          ./scripts/relup-base-vsns.escript check-vsn-db $PKG_VSN ./data/relup-paths-ee.eterm
       - name: Check relup (ce)
         if: endsWith(github.repository, 'emqx')
         run: ./scripts/update-appup.sh emqx --check
diff --git a/CHANGES-4.3.md b/CHANGES-4.3.md
index c13ef4d51..1595ecaed 100644
--- a/CHANGES-4.3.md
+++ b/CHANGES-4.3.md
@@ -15,6 +15,14 @@ File format:
 ### Bug fixes
 
 - Fix rule-engine update behaviour which may initialize actions for disabled rules. [#8849](https://github.com/emqx/emqx/pull/8849)
+- Fix JWT plugin don't support non-integer timestamp claims. [#8862](https://github.com/emqx/emqx/pull/8862)
+- Fix a possible dead loop caused by shared subscriptions with `shared_dispatch_ack_enabled=true`. [#8918](https://github.com/emqx/emqx/pull/8918)
+- Fix dashboard binding IP address not working. [#8916](https://github.com/emqx/emqx/pull/8916)
+- Fix rule SQL topic matching to null values failed. [#8927](https://github.com/emqx/emqx/pull/8927)
+  The following SQL should not fail (crash) but return `{"r": false}`:
+  `SELECT topic =~ 't' as r FROM "$events/client_connected"`.
+  The topic is a null value as there's no such field in event `$events/client_connected`, so it
+  should return false if match it to a topic.
 
 ## v4.3.19
 
@@ -22,7 +30,6 @@ File format:
 
 - Improve error message for LwM2M plugin when object ID is not valid. [#8654](https://github.com/emqx/emqx/pull/8654).
 - Add tzdata apk package to alpine docker image. [#8671](https://github.com/emqx/emqx/pull/8671)
-- Add node evacuation and cluster rebalancing features. [#8597](https://github.com/emqx/emqx/pull/8597)
 - Refine Rule Engine error log. RuleId will be logged when take action failed. [#8737](https://github.com/emqx/emqx/pull/8737)
 - Increases the latency interval for MQTT Bridge test connections to improve compatibility in high-latency environments. [#8745](https://github.com/emqx/emqx/pull/8745)
 - Close ExProto client process immediately if it's keepalive timeouted. [#8725](https://github.com/emqx/emqx/pull/8725)
diff --git a/CHANGES-4.4.md b/CHANGES-4.4.md
index ff34ad7f5..6cfa9f74a 100644
--- a/CHANGES-4.4.md
+++ b/CHANGES-4.4.md
@@ -1,20 +1,82 @@
 # EMQX 4.4 Changes
 
+## v4.4.9
+
+### Bug fixes  (synced from v4.3.20)
+
+- Fix rule-engine update behaviour which may initialize actions for disabled rules. [#8849](https://github.com/emqx/emqx/pull/8849)
+- Fix JWT plugin don't support non-integer timestamp claims. [#8862](https://github.com/emqx/emqx/pull/8862)
+- Fix a possible dead loop caused by shared subscriptions with `shared_dispatch_ack_enabled=true`. [#8918](https://github.com/emqx/emqx/pull/8918)
+- Fix dashboard binding IP address not working. [#8916](https://github.com/emqx/emqx/pull/8916)
+- Fix rule SQL topic matching to null values failed. [#8927](https://github.com/emqx/emqx/pull/8927)
+  The following SQL should not fail (crash) but return `{"r": false}`:
+  `SELECT topic =~ 't' as r FROM "$events/client_connected"`.
+  The topic is a null value as there's no such field in event `$events/client_connected`, so it
+  should return false if match it to a topic.
 
 ## v4.4.8
 
 ### Enhancements (synced from v4.3.19)
 * Support HTTP API `/trace/:name/detail`.
 
-
 ### Bug fixes
 - Fix: Check if emqx_mod_trace is enabled when the trace file is not found.
 
+### Enhancements (synced from v4.3.19)
 
-## v4.4.5
+- Improve error message for LwM2M plugin when object ID is not valid. [#8654](https://github.com/emqx/emqx/pull/8654).
+- Add tzdata apk package to alpine docker image. [#8671](https://github.com/emqx/emqx/pull/8671)
+- Refine Rule Engine error log. RuleId will be logged when take action failed. [#8737](https://github.com/emqx/emqx/pull/8737)
+- Increases the latency interval for MQTT Bridge test connections to improve compatibility in high-latency environments. [#8745](https://github.com/emqx/emqx/pull/8745)
+- Close ExProto client process immediately if it's keepalive timeouted. [#8725](https://github.com/emqx/emqx/pull/8725)
+- Upgrade grpc-erl driver to 0.6.7 to support batch operation in sending stream. [#8725](https://github.com/emqx/emqx/pull/8725)
+- Improved jwt authentication module initialization process. [#8736](https://github.com/emqx/emqx/pull/8736)
 
-### Enhancements (synced from v4.3.16)
-* HTTP API `mqtt/publish` support to publish with properties and user_properties.
+### Bug fixes (synced from v4.3.19)
+
+- Fix rule SQL compare to null values always returns false. [#8743](https://github.com/emqx/emqx/pull/8743)
+  Before this change, the following SQL failed to match on the WHERE clause (`clientid != foo` returns false):
+  `SELECT 'some_var' as clientid FROM "t" WHERE clientid != foo`.
+  The `foo` variable is a null value, so `clientid != foo` should be evaluated as true.
+- Fix GET `/auth_clientid` and `/auth_username` counts. [#8655](https://github.com/emqx/emqx/pull/8655)
+- Add an idle timer for ExProto UDP client to avoid client leaking [#8628](https://github.com/emqx/emqx/pull/8628)
+- Fix ExHook can't be un-hooked if the grpc service stop first. [#8725](https://github.com/emqx/emqx/pull/8725)
+- Fix the problem that ExHook cannot continue hook chains execution for mismatched topics. [#8807](https://github.com/emqx/emqx/pull/8807)
+- Fix GET `/listeners/` crashes when listener is not ready. [#8752](https://github.com/emqx/emqx/pull/8752)
+- Fix repeated warning messages in bin/emqx [#8824](https://github.com/emqx/emqx/pull/8824)
+
+
+## v4.4.7
+
+### Enhancements (synced from v4.3.18)
+
+- Make possible to debug-print SSL handshake procedure by setting listener config `log_level=debug` [#8553](https://github.com/emqx/emqx/pull/8553)
+- Add option to perform GC on connection process after TLS/SSL handshake is performed. [#8649](https://github.com/emqx/emqx/pull/8649)
+  Expected to reduce around 35% memory consumption for each SSL connection. See [#8637](https://github.com/emqx/emqx/pull/8637) for more details.
+
+## v4.4.6
+
+### Bug fixes (synced from v4.3.17)
+
+- Fixed issue where the dashboard APIs were being exposed under the
+  management listener. [#8411]
+
+- Fixed crash when shared persistent subscription [#8441]
+- Fixed issue in Lua hook that prevented messages from being
+  rejected [#8535]
+- Fix ExProto UDP client keepalive checking error.
+  This causes the clients to not expire as long as a new UDP packet arrives [#8575]
+
+### Enhancements (synced from v4.3.17)
+
+- HTTP API(GET /rules/) support for pagination and fuzzy filtering. [#8450]
+- Add check_conf cli to check config format. [#8486]
+- Optimize performance of shared subscription
+
+## v4.4.5 (v4.3.16)
+
+### Enhancements
+- HTTP API `mqtt/publish` support to publish with properties and user_properties.
 
 ### Bug fixes
 - Clean trace zip files when file has been downloaded.
diff --git a/apps/emqx_auth_jwt/src/emqx_auth_jwt.erl b/apps/emqx_auth_jwt/src/emqx_auth_jwt.erl
index 30a6ab43a..54716df1c 100644
--- a/apps/emqx_auth_jwt/src/emqx_auth_jwt.erl
+++ b/apps/emqx_auth_jwt/src/emqx_auth_jwt.erl
@@ -86,7 +86,7 @@ is_expired(Exp) when is_binary(Exp)  ->
             ?DEBUG("acl_deny_due_to_invalid_jwt_exp:~p", [Exp]),
             true
     end;
-is_expired(Exp) when is_integer(Exp) ->
+is_expired(Exp) when is_number(Exp) ->
     Now = erlang:system_time(second),
     Now > Exp;
 is_expired(Exp) ->
diff --git a/apps/emqx_auth_jwt/src/emqx_auth_jwt_svr.erl b/apps/emqx_auth_jwt/src/emqx_auth_jwt_svr.erl
index 0f09be22e..3a5c619aa 100644
--- a/apps/emqx_auth_jwt/src/emqx_auth_jwt_svr.erl
+++ b/apps/emqx_auth_jwt/src/emqx_auth_jwt_svr.erl
@@ -201,19 +201,19 @@ do_verify(JwsCompacted, [Jwk|More]) ->
 
 check_claims(Claims) ->
     Now = os:system_time(seconds),
-    Checker = [{<<"exp">>, with_int_value(
+    Checker = [{<<"exp">>, with_num_value(
                              fun(ExpireTime) -> Now < ExpireTime end)},
-               {<<"iat">>, with_int_value(
+               {<<"iat">>, with_num_value(
                              fun(IssueAt) -> IssueAt =< Now end)},
-               {<<"nbf">>, with_int_value(
+               {<<"nbf">>, with_num_value(
                              fun(NotBefore) -> NotBefore =< Now end)}
               ],
     do_check_claim(Checker, Claims).
 
-with_int_value(Fun) ->
+with_num_value(Fun) ->
     fun(Value) ->
             case Value of
-                Int when is_integer(Int) -> Fun(Int);
+                Num when is_number(Num) -> Fun(Num);
                 Bin when is_binary(Bin) ->
                     case emqx_auth_jwt:string_to_number(Bin) of
                         {ok, Num} -> Fun(Num);
diff --git a/apps/emqx_auth_jwt/test/emqx_auth_jwt_SUITE.erl b/apps/emqx_auth_jwt/test/emqx_auth_jwt_SUITE.erl
index 934d80f41..596b829a6 100644
--- a/apps/emqx_auth_jwt/test/emqx_auth_jwt_SUITE.erl
+++ b/apps/emqx_auth_jwt/test/emqx_auth_jwt_SUITE.erl
@@ -177,6 +177,30 @@ t_check_auth_str_exp(_Config) ->
     ct:pal("Auth result: ~p~n", [Result2]),
     ?assertMatch({ok, #{auth_result := success, jwt_claims := _}}, Result2).
 
+t_check_auth_float_exp(init, _Config) ->
+    application:unset_env(emqx_auth_jwt, verify_claims).
+t_check_auth_float_exp(_Config) ->
+    Plain = #{clientid => <<"client1">>, username => <<"plain">>, zone => external},
+    Exp = os:system_time(seconds) + 3.5,
+
+    Jwt0 = sign([{clientid, <<"client1">>},
+                 {username, <<"plain">>},
+                 {exp, Exp}], <<"HS256">>, <<"emqxsecret">>),
+    ct:pal("Jwt: ~p~n", [Jwt0]),
+
+    Result0 = emqx_access_control:authenticate(Plain#{password => Jwt0}),
+    ct:pal("Auth result: ~p~n", [Result0]),
+    ?assertMatch({ok, #{auth_result := success, jwt_claims := _}}, Result0),
+
+    Jwt1 = sign([{clientid, <<"client1">>},
+                 {username, <<"plain">>},
+                 {exp, 1.5}], <<"HS256">>, <<"emqxsecret">>),
+    ct:pal("Jwt: ~p~n", [Jwt1]),
+
+    Result1 = emqx_access_control:authenticate(Plain#{password => Jwt1}),
+    ct:pal("Auth result: ~p~n", [Result1]),
+    ?assertMatch({error, _}, Result1).
+
 t_check_claims(init, _Config) ->
     application:set_env(emqx_auth_jwt, verify_claims, [{sub, <<"value">>}]).
 t_check_claims(_Config) ->
diff --git a/apps/emqx_auth_mnesia/src/emqx_auth_mnesia.appup.src b/apps/emqx_auth_mnesia/src/emqx_auth_mnesia.appup.src
index 7906449db..49bc4ece6 100644
--- a/apps/emqx_auth_mnesia/src/emqx_auth_mnesia.appup.src
+++ b/apps/emqx_auth_mnesia/src/emqx_auth_mnesia.appup.src
@@ -1,7 +1,8 @@
 %% -*- mode: erlang -*-
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
-  [{"4.3.7",
+  [{"4.3.8",[{load_module,emqx_acl_mnesia_cli,brutal_purge,soft_purge,[]}]},
+   {"4.3.7",
     [{load_module,emqx_auth_mnesia_api,brutal_purge,soft_purge,[]},
      {load_module,emqx_acl_mnesia_cli,brutal_purge,soft_purge,[]}]},
    {<<"4\\.3\\.[5-6]">>,
@@ -33,7 +34,8 @@
      {load_module,emqx_acl_mnesia_cli,brutal_purge,soft_purge,[]},
      {load_module,emqx_auth_mnesia_app,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
-  [{"4.3.7",
+  [{"4.3.8",[{load_module,emqx_acl_mnesia_cli,brutal_purge,soft_purge,[]}]},
+   {"4.3.7",
     [{load_module,emqx_auth_mnesia_api,brutal_purge,soft_purge,[]},
      {load_module,emqx_acl_mnesia_cli,brutal_purge,soft_purge,[]}]},
    {<<"4\\.3\\.[5-6]">>,
diff --git a/apps/emqx_exproto/src/emqx_exproto.appup.src b/apps/emqx_exproto/src/emqx_exproto.appup.src
index 20939ae63..fcf2fe6db 100644
--- a/apps/emqx_exproto/src/emqx_exproto.appup.src
+++ b/apps/emqx_exproto/src/emqx_exproto.appup.src
@@ -1,7 +1,8 @@
 %% -*- mode: erlang -*-
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
-  [{"4.3.9",
+  [{"4.3.10",[{load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]}]},
+   {"4.3.9",
     [{load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]},
      {load_module,emqx_exproto_gcli,brutal_purge,soft_purge,[]}]},
    {<<"4\\.3\\.[2-8]">>,
@@ -14,7 +15,8 @@
      {load_module,emqx_exproto_conn,brutal_purge,soft_purge,[]},
      {load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
-  [{"4.3.9",
+  [{"4.3.10",[{load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]}]},
+   {"4.3.9",
     [{load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]},
      {load_module,emqx_exproto_gcli,brutal_purge,soft_purge,[]}]},
    {<<"4\\.3\\.[2-8]">>,
diff --git a/apps/emqx_exproto/src/emqx_exproto_channel.erl b/apps/emqx_exproto/src/emqx_exproto_channel.erl
index 4b354183e..6847b905e 100644
--- a/apps/emqx_exproto/src/emqx_exproto_channel.erl
+++ b/apps/emqx_exproto/src/emqx_exproto_channel.erl
@@ -66,7 +66,7 @@
 
 -opaque(channel() :: #channel{}).
 
--type(conn_state() :: idle | connecting | connected | disconnected).
+-type(conn_state() :: idle | connecting | connected | disconnected | accepted).
 
 -type(reply() :: {outgoing, binary()}
                | {outgoing, [binary()]}
@@ -159,7 +159,7 @@ init(ConnInfo = #{socktype := Socktype,
     Channel = #channel{gcli = #{channel => GRpcChann},
                        conninfo = NConnInfo1,
                        clientinfo = ClientInfo,
-                       conn_state = idle,
+                       conn_state = accepted,
                        timers = #{}
                       },
     case emqx_hooks:run_fold('client.connect', [NConnInfo], #{}) of
diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine.appup.src b/apps/emqx_rule_engine/src/emqx_rule_engine.appup.src
index d2e301245..612ec73af 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine.appup.src
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine.appup.src
@@ -3,6 +3,7 @@
 {VSN,
   [{"4.4.8",
     [{load_module,emqx_rule_registry,brutal_purge,soft_purge,[]},
+     {load_module,emqx_rule_runtime,brutal_purge,soft_purge,[]},
      {load_module,emqx_rule_engine,brutal_purge,soft_purge,[]}]},
    {<<"4\\.4\\.[6-7]">>,
     [{load_module,emqx_rule_engine,brutal_purge,soft_purge,[]},
@@ -86,6 +87,7 @@
    {<<".*">>,[]}],
   [{"4.4.8",
     [{load_module,emqx_rule_registry,brutal_purge,soft_purge,[]},
+     {load_module,emqx_rule_runtime,brutal_purge,soft_purge,[]},
      {load_module,emqx_rule_engine,brutal_purge,soft_purge,[]}]},
    {<<"4\\.4\\.[6-7]">>,
     [{load_module,emqx_rule_engine,brutal_purge,soft_purge,[]},
diff --git a/apps/emqx_rule_engine/src/emqx_rule_runtime.erl b/apps/emqx_rule_engine/src/emqx_rule_runtime.erl
index 794c70dfd..71775f6ee 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_runtime.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_runtime.erl
@@ -242,7 +242,10 @@ do_compare('>=', L, R) ->
     do_compare('=', L, R) orelse do_compare('>', L, R);
 do_compare('<>', L, R) -> L /= R;
 do_compare('!=', L, R) -> L /= R;
-do_compare('=~', T, F) -> emqx_topic:match(T, F).
+do_compare('=~', undefined, undefined) -> true;
+do_compare('=~', T, F) when T == undefined; F == undefined -> false;
+do_compare('=~', T, F) ->
+    emqx_topic:match(T, F).
 
 number(Bin) ->
     try binary_to_integer(Bin)
diff --git a/apps/emqx_rule_engine/test/emqx_rule_engine_SUITE.erl b/apps/emqx_rule_engine/test/emqx_rule_engine_SUITE.erl
index 3c0367360..d819aa5e3 100644
--- a/apps/emqx_rule_engine/test/emqx_rule_engine_SUITE.erl
+++ b/apps/emqx_rule_engine/test/emqx_rule_engine_SUITE.erl
@@ -2533,6 +2533,13 @@ t_sqlparse_compare_undefined(_Config) ->
     %% no match
     ?assertMatch({error, nomatch}, ?TEST_SQL(Sql00)),
 
+    Sql00_1 = "select "
+            " * "
+            "from \"t/#\" "
+            "where dev <> undefined ",
+    %% no match
+    ?assertMatch({error, nomatch}, ?TEST_SQL(Sql00_1)),
+
     Sql01 = "select "
             " 'd' as dev "
             "from \"t/#\" "
@@ -2541,13 +2548,29 @@ t_sqlparse_compare_undefined(_Config) ->
     %% pass
     ?assertMatch(#{}, Res01),
 
+    Sql01_1 = "select "
+            " 'd' as dev "
+            "from \"t/#\" "
+            "where dev <> undefined ",
+    {ok, Res01_1} = ?TEST_SQL(Sql01_1),
+    %% pass
+    ?assertMatch(#{}, Res01_1),
+
     Sql02 = "select "
             " * "
             "from \"t/#\" "
             "where dev != 'undefined' ",
     {ok, Res02} = ?TEST_SQL(Sql02),
     %% pass
-    ?assertMatch(#{}, Res02).
+    ?assertMatch(#{}, Res02),
+
+    Sql03 = "select "
+            " * "
+            "from \"t/#\" "
+            "where dev =~ 'undefined' ",
+    Res03 = ?TEST_SQL(Sql03),
+    %% no match
+    ?assertMatch({error, nomatch}, Res03).
 
 t_sqlparse_compare_null_null(_Config) ->
     %% test undefined == undefined
@@ -2566,6 +2589,14 @@ t_sqlparse_compare_null_null(_Config) ->
     ?assertMatch(#{<<"c">> := false
                    }, Res01),
 
+    %% test undefined <> undefined
+    Sql01_1 = "select "
+            " a <> b as c "
+            "from \"t/#\" ",
+    {ok, Res01_1} = ?TEST_SQL(Sql01_1),
+    ?assertMatch(#{<<"c">> := false
+                   }, Res01_1),
+
     %% test undefined > undefined
     Sql02 = "select "
             " a > b as c "
@@ -2596,10 +2627,18 @@ t_sqlparse_compare_null_null(_Config) ->
             "from \"t/#\" ",
     {ok, Res05} = ?TEST_SQL(Sql05),
     ?assertMatch(#{<<"c">> := true
-                   }, Res05).
+                   }, Res05),
+
+    %% test undefined =~ undefined
+    Sql06 = "select "
+            " a =~ b as c "
+            "from \"t/#\" ",
+    {ok, Res06} = ?TEST_SQL(Sql06),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res06).
 
 t_sqlparse_compare_null_notnull(_Config) ->
-    %% test undefined == b
+    %% test undefined == 'b'
     Sql00 = "select "
             " 'b' as b, a = b as c "
             "from \"t/#\" ",
@@ -2607,7 +2646,7 @@ t_sqlparse_compare_null_notnull(_Config) ->
     ?assertMatch(#{<<"c">> := false
                    }, Res00),
 
-    %% test undefined != b
+    %% test undefined != 'b'
     Sql01 = "select "
             " 'b' as b, a != b as c "
             "from \"t/#\" ",
@@ -2615,7 +2654,15 @@ t_sqlparse_compare_null_notnull(_Config) ->
     ?assertMatch(#{<<"c">> := true
                    }, Res01),
 
-    %% test undefined > b
+    %% test undefined <> 'b'
+    Sql01_1 = "select "
+            " 'b' as b, a <> b as c "
+            "from \"t/#\" ",
+    {ok, Res01_1} = ?TEST_SQL(Sql01_1),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res01_1),
+
+    %% test undefined > 'b'
     Sql02 = "select "
             " 'b' as b, a > b as c "
             "from \"t/#\" ",
@@ -2623,7 +2670,7 @@ t_sqlparse_compare_null_notnull(_Config) ->
     ?assertMatch(#{<<"c">> := false
                    }, Res02),
 
-    %% test undefined < b
+    %% test undefined < 'b'
     Sql03 = "select "
             " 'b' as b, a < b as c "
             "from \"t/#\" ",
@@ -2631,7 +2678,7 @@ t_sqlparse_compare_null_notnull(_Config) ->
     ?assertMatch(#{<<"c">> := false
                    }, Res03),
 
-    %% test undefined <= b
+    %% test undefined <= 'b'
     Sql04 = "select "
             " 'b' as b, a <= b as c "
             "from \"t/#\" ",
@@ -2639,13 +2686,21 @@ t_sqlparse_compare_null_notnull(_Config) ->
     ?assertMatch(#{<<"c">> := false
                    }, Res04),
 
-    %% test undefined >= b
+    %% test undefined >= 'b'
     Sql05 = "select "
             " 'b' as b, a >= b as c "
             "from \"t/#\" ",
     {ok, Res05} = ?TEST_SQL(Sql05),
     ?assertMatch(#{<<"c">> := false
-                   }, Res05).
+                   }, Res05),
+
+    %% test undefined =~ 'b'
+    Sql06 = "select "
+            " 'b' as b, a =~ b as c "
+            "from \"t/#\" ",
+    {ok, Res06} = ?TEST_SQL(Sql06),
+    ?assertMatch(#{<<"c">> := false
+                   }, Res06).
 
 t_sqlparse_compare_notnull_null(_Config) ->
     %% test 'a' == undefined
@@ -2664,6 +2719,14 @@ t_sqlparse_compare_notnull_null(_Config) ->
     ?assertMatch(#{<<"c">> := true
                    }, Res01),
 
+    %% test 'a' <> undefined
+    Sql01_1 = "select "
+            " 'a' as a, a <> b as c "
+            "from \"t/#\" ",
+    {ok, Res01_1} = ?TEST_SQL(Sql01_1),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res01_1),
+
     %% test 'a' > undefined
     Sql02 = "select "
             " 'a' as a, a > b as c "
@@ -2694,7 +2757,15 @@ t_sqlparse_compare_notnull_null(_Config) ->
             "from \"t/#\" ",
     {ok, Res05} = ?TEST_SQL(Sql05),
     ?assertMatch(#{<<"c">> := false
-                   }, Res05).
+                   }, Res05),
+
+    %% test 'a' =~ undefined
+    Sql06 = "select "
+            " 'a' as a, a =~ b as c "
+            "from \"t/#\" ",
+    {ok, Res06} = ?TEST_SQL(Sql06),
+    ?assertMatch(#{<<"c">> := false
+                   }, Res06).
 
 t_sqlparse_compare(_Config) ->
     Sql00 = "select "
@@ -2704,6 +2775,13 @@ t_sqlparse_compare(_Config) ->
     ?assertMatch(#{<<"c">> := true
                    }, Res00),
 
+    Sql00_1 = "select "
+            " 'true' as a, true as b, a = b as c "
+            "from \"t/#\" ",
+    {ok, Res00_1} = ?TEST_SQL(Sql00_1),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res00_1),
+
     Sql01 = "select "
             " is_null(a) as c "
             "from \"t/#\" ",
@@ -2732,7 +2810,21 @@ t_sqlparse_compare(_Config) ->
     ?assertMatch(#{<<"c">> := false
                    }, Res04),
 
-    %% test 'a' >= undefined
+    Sql04_0 = "select "
+            " 1 as a, 1 as b, a = b as c "
+            "from \"t/#\" ",
+    {ok, Res04_0} = ?TEST_SQL(Sql04_0),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res04_0),
+
+    Sql04_1 = "select "
+            " 1 as a, '1' as b, a = b as c "
+            "from \"t/#\" ",
+    {ok, Res04_1} = ?TEST_SQL(Sql04_1),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res04_1),
+
+    %% test 1 >= 2
     Sql05 = "select "
             " 1 as a, 2 as b, a >= b as c "
             "from \"t/#\" ",
@@ -2740,13 +2832,37 @@ t_sqlparse_compare(_Config) ->
     ?assertMatch(#{<<"c">> := false
                    }, Res05),
 
-    %% test 'a' >= undefined
+    %% test 1 <= 2
     Sql06 = "select "
             " 1 as a, 2 as b, a <= b as c "
             "from \"t/#\" ",
     {ok, Res06} = ?TEST_SQL(Sql06),
     ?assertMatch(#{<<"c">> := true
-                   }, Res06).
+                   }, Res06),
+
+    %% test 1 != 2
+    Sql07 = "select "
+            " 1 as a, 2 as b, a != b as c "
+            "from \"t/#\" ",
+    {ok, Res07} = ?TEST_SQL(Sql07),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res07),
+
+    %% test 1 <> 2
+    Sql07_1 = "select "
+            " 1 as a, 2 as b, a <> b as c "
+            "from \"t/#\" ",
+    {ok, Res07_1} = ?TEST_SQL(Sql07_1),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res07_1),
+
+    %% test 't' =~ 't'
+    Sql08 = "select "
+            " 't' as a, 't' as b, a =~ b as c "
+            "from \"t/#\" ",
+    {ok, Res08} = ?TEST_SQL(Sql08),
+    ?assertMatch(#{<<"c">> := true
+                   }, Res08).
 
 t_sqlparse_new_map(_Config) ->
     %% construct a range without 'as'
diff --git a/data/relup-paths.eterm b/data/relup-paths.eterm
index 02d171e8f..640e54cd3 100644
--- a/data/relup-paths.eterm
+++ b/data/relup-paths.eterm
@@ -29,4 +29,10 @@
        [<<"4.4.0">>,<<"4.4.1">>,<<"4.4.2">>,<<"4.4.3">>,<<"4.4.4">>,
         <<"4.4.5">>,<<"4.4.6">>,<<"4.4.7">>],
    otp => <<"24.1.5-3">>}}.
-{<<"4.5.0">>,#{from_versions => [<<"4.4.8">>],otp => <<"24.3.4.2-1">>}}.
+{<<"4.4.9">>,
+ #{from_versions =>
+       [<<"4.4.0">>,<<"4.4.1">>,<<"4.4.2">>,<<"4.4.3">>,<<"4.4.4">>,
+        <<"4.4.5">>,<<"4.4.6">>,<<"4.4.7">>,<<"4.4.8">>],
+   otp => <<"24.1.5-3">>}}.
+{<<"4.5.0">>,#{from_versions => [<<"4.4.8">>,<<"4.4.9">>],
+               otp => <<"24.3.4.2-1">>}}.
diff --git a/deploy/charts/emqx/Chart.yaml b/deploy/charts/emqx/Chart.yaml
index 84a5c91d6..ecb38c250 100644
--- a/deploy/charts/emqx/Chart.yaml
+++ b/deploy/charts/emqx/Chart.yaml
@@ -13,8 +13,8 @@ type: application
 
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
-version: 4.4.8
+version: 4.4.9
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.
-appVersion: 4.4.8
+appVersion: 4.4.9
diff --git a/include/emqx_release.hrl b/include/emqx_release.hrl
index 261b38af0..3626ca4ef 100644
--- a/include/emqx_release.hrl
+++ b/include/emqx_release.hrl
@@ -29,7 +29,7 @@
 
 -ifndef(EMQX_ENTERPRISE).
 
--define(EMQX_RELEASE, {opensource, "4.4.8"}).
+-define(EMQX_RELEASE, {opensource, "4.4.9-alpha.2"}).
 
 -else.
 
diff --git a/lib-ce/emqx_dashboard/priv/emqx_dashboard.schema b/lib-ce/emqx_dashboard/priv/emqx_dashboard.schema
index 43093c3ba..7ef39ac8d 100644
--- a/lib-ce/emqx_dashboard/priv/emqx_dashboard.schema
+++ b/lib-ce/emqx_dashboard/priv/emqx_dashboard.schema
@@ -11,7 +11,7 @@
 ]}.
 
 {mapping, "dashboard.listener.http", "emqx_dashboard.listeners", [
-  {datatype, integer}
+  {datatype, [integer, ip]}
 ]}.
 
 {mapping, "dashboard.listener.http.acceptors", "emqx_dashboard.listeners", [
@@ -39,7 +39,7 @@
 ]}.
 
 {mapping, "dashboard.listener.https", "emqx_dashboard.listeners", [
-  {datatype, integer}
+  {datatype, [integer, ip]}
 ]}.
 
 {mapping, "dashboard.listener.https.acceptors", "emqx_dashboard.listeners", [
diff --git a/lib-ce/emqx_dashboard/src/emqx_dashboard.app.src b/lib-ce/emqx_dashboard/src/emqx_dashboard.app.src
index 18f01de01..1581ce2cc 100644
--- a/lib-ce/emqx_dashboard/src/emqx_dashboard.app.src
+++ b/lib-ce/emqx_dashboard/src/emqx_dashboard.app.src
@@ -1,6 +1,6 @@
 {application, emqx_dashboard,
  [{description, "EMQX Web Dashboard"},
-  {vsn, "4.4.7"}, % strict semver, bump manually!
+  {vsn, "4.4.8"}, % strict semver, bump manually!
   {modules, []},
   {registered, [emqx_dashboard_sup]},
   {applications, [kernel,stdlib,mnesia,minirest]},
diff --git a/lib-ce/emqx_dashboard/src/emqx_dashboard.erl b/lib-ce/emqx_dashboard/src/emqx_dashboard.erl
index 0cf63194c..c65c47c22 100644
--- a/lib-ce/emqx_dashboard/src/emqx_dashboard.erl
+++ b/lib-ce/emqx_dashboard/src/emqx_dashboard.erl
@@ -54,7 +54,8 @@ start_listener({Proto, Port, Options}) ->
         https -> minirest:start_https(Server, RanchOpts, Dispatch)
     end.
 
-ranch_opts(Port, Options0) ->
+ranch_opts(Bind, Options0) ->
+    IpPort = ip_port(Bind),
     NumAcceptors = get_value(num_acceptors, Options0, 4),
     MaxConnections = get_value(max_connections, Options0, 512),
     Options = lists:foldl(fun({K, _V}, Acc) when K =:= max_connections orelse K =:= num_acceptors ->
@@ -68,7 +69,13 @@ ranch_opts(Port, Options0) ->
                           end, [], Options0),
     #{num_acceptors => NumAcceptors,
       max_connections => MaxConnections,
-      socket_opts => [{port, Port} | Options]}.
+      socket_opts => IpPort ++  Options}.
+
+ip_port({IpStr, Port}) ->
+    {ok, Ip} = inet:parse_address(IpStr),
+    [{ip, Ip}, {port, Port}];
+ip_port(Port) when is_integer(Port) ->
+    [{port, Port}].
 
 stop_listeners() ->
     lists:foreach(fun(Listener) -> stop_listener(Listener) end, listeners()).
diff --git a/lib-ce/emqx_dashboard/test/emqx_dashboard_SUITE.erl b/lib-ce/emqx_dashboard/test/emqx_dashboard_SUITE.erl
index d6f76751d..6121b1389 100644
--- a/lib-ce/emqx_dashboard/test/emqx_dashboard_SUITE.erl
+++ b/lib-ce/emqx_dashboard/test/emqx_dashboard_SUITE.erl
@@ -327,7 +327,12 @@ setup_node(Node, Apps) ->
                 application:set_env(emqx_management, listeners, []),
                 ok;
            (emqx_dashboard) ->
-                application:set_env(emqx_dashboard, listeners, []),
+                Options = [{http,{"127.0.0.1",18184},
+                            [{num_acceptors,4},
+                            {max_connections,512},
+                            {inet6,false},
+                            {ipv6_v6only,false}]}],
+                application:set_env(emqx_dashboard, listeners, Options),
                 ok;
            (_) ->
                 ok
diff --git a/rebar.config b/rebar.config
index 1acd56522..0e01e9c2d 100644
--- a/rebar.config
+++ b/rebar.config
@@ -50,7 +50,7 @@
     , {ekka, {git, "https://github.com/emqx/ekka", {tag, "0.8.1.11"}}}
     , {gen_rpc, {git, "https://github.com/emqx/gen_rpc", {tag, "2.7.1"}}}
     , {cuttlefish, {git, "https://github.com/emqx/cuttlefish", {tag, "v3.3.6"}}}
-    , {minirest, {git, "https://github.com/emqx/minirest", {tag, "0.3.7"}}}
+    , {minirest, {git, "https://github.com/emqx/minirest", {tag, "0.3.9"}}}
     , {ecpool, {git, "https://github.com/emqx/ecpool", {tag, "0.5.2"}}}
     , {replayq, {git, "https://github.com/emqx/replayq", {tag, "0.3.4"}}}
     , {pbkdf2, {git, "https://github.com/emqx/erlang-pbkdf2.git", {branch, "2.0.4"}}}
diff --git a/scripts/relup-base-vsns.escript b/scripts/relup-base-vsns.escript
index 307d4f5fd..6c618ca45 100755
--- a/scripts/relup-base-vsns.escript
+++ b/scripts/relup-base-vsns.escript
@@ -285,4 +285,4 @@ print_warning(Msg) ->
     print_warning(Msg, []).
 
 print_warning(Msg, Args) ->
-    io:format(user, ?RED ++ Msg ++ ?RESET, Args).
+    io:format(standard_error, ?RED ++ Msg ++ ?RESET, Args).
diff --git a/scripts/relup-base-vsns.sh b/scripts/relup-base-vsns.sh
index 15b97921c..1aa2b3288 100755
--- a/scripts/relup-base-vsns.sh
+++ b/scripts/relup-base-vsns.sh
@@ -44,9 +44,11 @@ fi
 case "${EDITION}" in
     *enterprise*)
         GIT_TAG_PREFIX="e"
+        RELUP_PATH_FILE="./data/relup-paths-ee.eterm"
         ;;
     *)
         GIT_TAG_PREFIX="v"
+        RELUP_PATH_FILE="./data/relup-paths.eterm"
         ;;
 esac
 
@@ -54,10 +56,12 @@ esac
 TAGS=( 'dummy' )
 TAGS_EXCLUDE=( 'dummy' )
 
-while read -r vsn; do
+base_versions="$(./scripts/relup-base-vsns.escript base-vsns "$CUR" "$RELUP_PATH_FILE" | xargs echo -n)"
+
+for vsn in ${base_versions}; do
     # shellcheck disable=SC2207
     TAGS+=($(git tag -l "${GIT_TAG_PREFIX}${vsn}"))
-done < <(./scripts/relup-base-vsns.escript base-vsns "$CUR" ./data/relup-paths.eterm)
+done
 
 for tag_to_del in "${TAGS_EXCLUDE[@]}"; do
     TAGS=( "${TAGS[@]/$tag_to_del}" )
diff --git a/scripts/update_appup.escript b/scripts/update_appup.escript
index 141fd5833..9282aa902 100755
--- a/scripts/update_appup.escript
+++ b/scripts/update_appup.escript
@@ -374,12 +374,12 @@ ensure_version(Version, OldInstructions) ->
 
 contains_version(Needle, Haystack) when is_list(Needle) ->
     lists:any(
-      fun(<<"*">>) -> true; %% TODO: delete after we pass esockd 5.8.4
-         (Regex) when is_binary(Regex) ->
+      fun(Regex) when is_binary(Regex) ->
+              Length = length(Needle),
               case re:run(Needle, Regex) of
-                  {match, _} ->
+                  {match, [{0, Length}]} ->
                       true;
-                  nomatch ->
+                  _ ->
                       false
               end;
          (Vsn) ->
diff --git a/src/emqx.appup.src b/src/emqx.appup.src
index bc34d7ac6..690acc648 100644
--- a/src/emqx.appup.src
+++ b/src/emqx.appup.src
@@ -2,10 +2,15 @@
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
   [{"4.4.8",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_relup,brutal_purge,soft_purge,[]},
+     {load_module,emqx_app,brutal_purge,soft_purge,[]},
+     {load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_message,brutal_purge,soft_purge,[]}]},
    {"4.4.7",
-    [{load_module,emqx_message,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
+     {load_module,emqx_message,brutal_purge,soft_purge,[]},
      {load_module,emqx_relup,brutal_purge,soft_purge,[]},
      {load_module,emqx,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
@@ -14,7 +19,8 @@
      {load_module,emqx_channel,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.4.6",
-    [{load_module,emqx_message,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
+     {load_module,emqx_message,brutal_purge,soft_purge,[]},
      {load_module,emqx_relup,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
@@ -197,10 +203,15 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
   [{"4.4.8",
-    [{load_module,emqx_cm,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_relup,brutal_purge,soft_purge,[]},
+     {load_module,emqx_app,brutal_purge,soft_purge,[]},
+     {load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_message,brutal_purge,soft_purge,[]}]},
    {"4.4.7",
-    [{load_module,emqx_message,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
+     {load_module,emqx_message,brutal_purge,soft_purge,[]},
      {load_module,emqx_relup,brutal_purge,soft_purge,[]},
      {load_module,emqx,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
@@ -209,7 +220,8 @@
      {load_module,emqx_channel,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]}]},
    {"4.4.6",
-    [{load_module,emqx_message,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_shared_sub,brutal_purge,soft_purge,[]},
+     {load_module,emqx_message,brutal_purge,soft_purge,[]},
      {load_module,emqx_relup,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
diff --git a/src/emqx_channel.erl b/src/emqx_channel.erl
index f3fb6194b..881a0f3f9 100644
--- a/src/emqx_channel.erl
+++ b/src/emqx_channel.erl
@@ -760,8 +760,8 @@ handle_deliver(Delivers, Channel = #channel{
     %% NOTE: Order is important here. While the takeover is in
     %% progress, the session cannot enqueue messages, since it already
     %% passed on the queue to the new connection in the session state.
-    NPendings = lists:append(Pendings,
-        ignore_local(ClientInfo, maybe_nack(Delivers), ClientId, Session)),
+    NDelivers = ignore_local(ClientInfo, maybe_discard_shared_delivers(Delivers), ClientId, Session),
+    NPendings = lists:append(Pendings, NDelivers),
     {ok, Channel#channel{pendings = NPendings}};
 
 handle_deliver(Delivers, Channel = #channel{
@@ -769,8 +769,8 @@ handle_deliver(Delivers, Channel = #channel{
         takeover   = false,
         session    = Session,
         clientinfo = #{clientid := ClientId} = ClientInfo}) ->
-    NSession = emqx_session:enqueue(ClientInfo,
-        ignore_local(ClientInfo, maybe_nack(Delivers), ClientId, Session), Session),
+    NDelivers = ignore_local(ClientInfo, maybe_discard_shared_delivers(Delivers), ClientId, Session),
+    NSession = emqx_session:enqueue(ClientInfo, NDelivers, Session),
     {ok, Channel#channel{session = NSession}};
 
 handle_deliver(Delivers, Channel = #channel{
@@ -801,12 +801,23 @@ ignore_local(ClientInfo, Delivers, Subscriber, Session) ->
                     end, Delivers).
 
 %% Nack delivers from shared subscription
-maybe_nack(Delivers) ->
-    lists:filter(fun not_nacked/1, Delivers).
-
-not_nacked({deliver, _Topic, Msg}) ->
-    not (emqx_shared_sub:is_ack_required(Msg)
-         andalso (ok == emqx_shared_sub:nack_no_connection(Msg))).
+maybe_discard_shared_delivers(Delivers) ->
+    lists:filtermap(
+      fun({deliver, Topic, Msg}) ->
+              case emqx_shared_sub:is_ack_required(Msg) of
+                  false ->
+                      true;
+                  true ->
+                      case emqx_shared_sub:is_retry_dispatch(Msg) of
+                          true ->
+                              %% force enqueue the retried shared deliver
+                              {true, {deliver, Topic, emqx_shared_sub:maybe_ack(Msg)}};
+                          false ->
+                              ok = emqx_shared_sub:nack_no_connection(Msg),
+                              false
+                      end
+              end
+      end, Delivers).
 
 %%--------------------------------------------------------------------
 %% Handle outgoing packet
diff --git a/src/emqx_shared_sub.erl b/src/emqx_shared_sub.erl
index 337d63d15..cc57e001f 100644
--- a/src/emqx_shared_sub.erl
+++ b/src/emqx_shared_sub.erl
@@ -46,15 +46,14 @@
         , maybe_nack_dropped/1
         , nack_no_connection/1
         , is_ack_required/1
+        , is_retry_dispatch/1
         , get_group/1
         ]).
 
 %% for testing
 -ifdef(TEST).
--export([ subscribers/2
-        , ack_enabled/0
-        , strategy/1
-        ]).
+-compile(export_all).
+-compile(nowarn_export_all).
 -endif.
 
 %% gen_server callbacks
@@ -239,6 +238,13 @@ get_group(Msg) ->
 -spec(is_ack_required(emqx_types:message()) -> boolean()).
 is_ack_required(Msg) -> ?NO_ACK =/= get_group_ack(Msg).
 
+-spec(is_retry_dispatch(emqx_types:message()) -> boolean()).
+is_retry_dispatch(Msg) ->
+    case get_group_ack(Msg) of
+        {_Sender, {retry, _Group, _Ref}} -> true;
+        _ -> false
+    end.
+
 %% @doc Negative ack dropped message due to inflight window or message queue being full.
 -spec(maybe_nack_dropped(emqx_types:message()) -> store | drop).
 maybe_nack_dropped(Msg) ->
@@ -280,10 +286,15 @@ maybe_ack(Msg) ->
             Msg;
         Ack ->
             {Sender, Ref} = fetch_sender_ref(Ack),
-            Sender ! {Ref, ?ACK},
+            ack(Sender, Ref),
             without_group_ack(Msg)
     end.
 
+-spec(ack(pid(), reference()) -> ok).
+ack(Sender, Ref) ->
+    Sender ! {Ref, ?ACK},
+    ok.
+
 fetch_sender_ref({Sender, {_Type, _Group, Ref}}) -> {Sender, Ref};
 %% These clauses are for backward compatibility
 fetch_sender_ref({Sender, Ref}) -> {Sender, Ref}.
diff --git a/test/emqx_channel_SUITE.erl b/test/emqx_channel_SUITE.erl
index 8d3d03b87..06e5e4eaa 100644
--- a/test/emqx_channel_SUITE.erl
+++ b/test/emqx_channel_SUITE.erl
@@ -483,6 +483,45 @@ t_handle_deliver_nl(_) ->
     NMsg = emqx_message:set_flag(nl, Msg),
     {ok, Channel} = emqx_channel:handle_deliver([{deliver, <<"t1">>, NMsg}], Channel).
 
+t_handle_deliver_shared_in_no_connection(_) ->
+    Grp = <<"g">>,
+    Sender = self(),
+    Ref1 = make_ref(),
+    Ref2 = make_ref(),
+    Chann = emqx_channel:set_field(conn_state, disconnected, channel()),
+
+    Msg0 = emqx_shared_sub:with_group_ack(
+             emqx_message:make(test, ?QOS_1, <<"t">>, <<"qos1">>),
+             Grp,
+             fresh,
+             Sender,
+             Ref1
+            ),
+    Msg1 = emqx_shared_sub:with_group_ack(
+             emqx_message:make(test, ?QOS_2, <<"t">>, <<"qos2">>),
+             Grp,
+             retry,
+             Sender,
+             Ref2
+            ),
+    Delivers = [{deliver, <<"+">>, Msg0}, {deliver, <<"+">>, Msg1}],
+
+    %% all shared msgs should be queued if shared_dispatch_ack_enabled=false
+    meck:new(emqx_shared_sub, [passthrough, no_history]),
+    meck:expect(emqx_shared_sub, is_ack_required, fun(_) -> false end),
+    {ok, Chann1} = emqx_channel:handle_deliver(Delivers, Chann),
+    ?assertEqual(2, proplists:get_value(mqueue_len, emqx_channel:stats(Chann1))),
+    meck:unload(emqx_shared_sub),
+
+    %% only fresh shared msgs should be queued if shared_dispatch_ack_enabled=true
+    meck:new(emqx_shared_sub, [passthrough, no_history]),
+    meck:expect(emqx_shared_sub, is_ack_required, fun(_) -> true end),
+    {ok, Chann2} = emqx_channel:handle_deliver(Delivers, Chann),
+    ?assertEqual(1, proplists:get_value(mqueue_len, emqx_channel:stats(Chann2))),
+    receive {Ref1, {shared_sub_nack, no_connection}} -> ok after 0 -> ?assert(false) end,
+    receive {Ref2, shared_sub_ack} -> ok after 0 -> ?assert(false) end,
+    meck:unload(emqx_shared_sub).
+
 %%--------------------------------------------------------------------
 %% Test cases for handle_out
 %%--------------------------------------------------------------------