diff --git a/apps/emqx/src/emqx_channel.erl b/apps/emqx/src/emqx_channel.erl
index a12df9c64..e82adc786 100644
--- a/apps/emqx/src/emqx_channel.erl
+++ b/apps/emqx/src/emqx_channel.erl
@@ -1136,7 +1136,6 @@ do_deliver(Publishes, Channel) when is_list(Publishes) ->
     {Packets, NChannel} =
         lists:foldl(
             fun(Publish, {Acc, Chann}) ->
-                %% @FIXME perf:  list append with copy left list
                 {Packets, NChann} = do_deliver(Publish, Chann),
                 {Packets ++ Acc, NChann}
             end,
diff --git a/apps/emqx/src/emqx_connection.erl b/apps/emqx/src/emqx_connection.erl
index be420d65e..ff3ee81a9 100644
--- a/apps/emqx/src/emqx_connection.erl
+++ b/apps/emqx/src/emqx_connection.erl
@@ -118,7 +118,7 @@
     %% limiter timers
     limiter_timer :: undefined | reference(),
 
-    %% QUIC conn pid if is a pid
+    %% QUIC conn owner pid if in use.
     quic_conn_pid :: maybe(pid())
 }).
 
@@ -336,7 +336,6 @@ init_state(
     Limiter = emqx_limiter_container:get_limiter_by_types(Listener, LimiterTypes, LimiterCfg),
 
     FrameOpts = #{
-        %% @TODO:q what is strict_mode?
         strict_mode => emqx_config:get_zone_conf(Zone, [mqtt, strict_mode]),
         max_size => emqx_config:get_zone_conf(Zone, [mqtt, max_packet_size])
     },
diff --git a/apps/emqx/test/emqx_quic_multistreams_SUITE.erl b/apps/emqx/test/emqx_quic_multistreams_SUITE.erl
index b6d3c661c..025790ef7 100644
--- a/apps/emqx/test/emqx_quic_multistreams_SUITE.erl
+++ b/apps/emqx/test/emqx_quic_multistreams_SUITE.erl
@@ -661,14 +661,14 @@ t_multi_streams_packet_too_large(Config) ->
     PubQos = ?config(pub_qos, Config),
     SubQos = ?config(sub_qos, Config),
     Topic = atom_to_binary(?FUNCTION_NAME),
-    meck:new(emqx_frame, [passthrough, no_history]),
-    ok = meck:expect(
-        emqx_frame,
-        serialize_opts,
-        fun(#mqtt_packet_connect{proto_ver = ProtoVer}) ->
-            #{version => ProtoVer, max_size => 1024}
-        end
-    ),
+    RecQos = calc_qos(PubQos, SubQos),
+    PktId1 = calc_pkt_id(RecQos, 1),
+    PktId2 = calc_pkt_id(RecQos, 2),
+    PktId3 = calc_pkt_id(RecQos, 3),
+
+    OldMax = emqx_config:get_zone_conf(default, [mqtt, max_packet_size]),
+    emqx_config:put_zone_conf(default, [mqtt, max_packet_size], 1000),
+
     {ok, C} = emqtt:start_link([{proto_ver, v5} | Config]),
     {ok, _} = emqtt:quic_connect(C),
     {ok, _, [SubQos]} = emqtt:subscribe(C, #{}, [{Topic, [{qos, SubQos}]}]),
@@ -678,13 +678,95 @@ t_multi_streams_packet_too_large(Config) ->
         C,
         PubVia,
         Topic,
-        binary:copy(<<"stream data 1">>, 1024),
+        <<"stream data 1">>,
         [{qos, PubQos}],
         undefined
     ),
+
+    ok = emqtt:publish_async(
+        C,
+        PubVia,
+        Topic,
+        <<"stream data 2">>,
+        [{qos, PubQos}],
+        undefined
+    ),
+
+    PubRecvs = recv_pub(2),
+    ?assertMatch(
+        [
+            {publish, #{
+                client_pid := C,
+                packet_id := PktId1,
+                payload := <<"stream data 1">>,
+                qos := RecQos,
+                topic := Topic
+            }},
+            {publish, #{
+                client_pid := C,
+                packet_id := PktId2,
+                payload := <<"stream data 2">>,
+                qos := RecQos,
+                topic := Topic
+            }}
+        ],
+        PubRecvs
+    ),
+
+    {ok, PubVia2} = emqtt:start_data_stream(C, []),
+    ok = emqtt:publish_async(
+        C,
+        PubVia2,
+        Topic,
+        binary:copy(<<"too large">>, 200),
+        [{qos, PubQos}],
+        undefined
+    ),
+    timer:sleep(200),
+    ?assert(is_list(emqtt:info(C))),
+
+    timeout = recv_pub(1),
+
+    %% send large payload on stream 1
+    ok = emqtt:publish_async(
+        C,
+        PubVia,
+        Topic,
+        binary:copy(<<"too large">>, 200),
+        [{qos, PubQos}],
+        undefined
+    ),
+    timer:sleep(200),
     timeout = recv_pub(1),
     ?assert(is_list(emqtt:info(C))),
-    ok = meck:unload(emqx_frame),
+
+    %% Connection could be kept
+    {error, stm_send_error, _} = quicer:send(via_stream(PubVia), <<1>>),
+    {error, stm_send_error, _} = quicer:send(via_stream(PubVia2), <<1>>),
+    %% We could send data over new stream
+    {ok, PubVia3} = emqtt:start_data_stream(C, []),
+    ok = emqtt:publish_async(
+        C,
+        PubVia3,
+        Topic,
+        <<"stream data 3">>,
+        [{qos, PubQos}],
+        undefined
+    ),
+    [
+        {publish, #{
+            client_pid := C,
+            packet_id := PktId3,
+            payload := <<"stream data 3">>,
+            qos := RecQos,
+            topic := Topic
+        }}
+    ] = recv_pub(1),
+    timer:sleep(200),
+
+    ?assert(is_list(emqtt:info(C))),
+
+    emqx_config:put_zone_conf(default, [mqtt, max_packet_size], OldMax),
     ok = emqtt:disconnect(C).
 
 t_conn_change_client_addr(Config) ->
@@ -1758,3 +1840,8 @@ select_port() ->
     end,
     ct:pal("select port: ~p", [Port]),
     Port.
+
+-spec via_stream({quic, quicer:connection_handle(), quicer:stream_handle()}) ->
+    quicer:stream_handle().
+via_stream({quic, _Conn, Stream}) ->
+    Stream.