diff --git a/apps/emqx_resource/test/emqx_resource_SUITE.erl b/apps/emqx_resource/test/emqx_resource_SUITE.erl
index 1516fc870..620516a88 100644
--- a/apps/emqx_resource/test/emqx_resource_SUITE.erl
+++ b/apps/emqx_resource/test/emqx_resource_SUITE.erl
@@ -618,6 +618,8 @@ t_query_counter_async_inflight_batch(_) ->
     ),
     tap_metrics(?LINE),
 
+    Sent1 = NumMsgs + BatchSize,
+
     ?check_trace(
         begin
             %% this will block the resource_worker as the inflight window is full now
@@ -633,6 +635,12 @@ t_query_counter_async_inflight_batch(_) ->
         []
     ),
 
+    %% NOTE
+    %% The query above won't affect the size of the results table for some reason,
+    %% it's not clear if this is expected behaviour. Only the `async_reply_fun`
+    %% defined below will be called for the whole batch consisting of 2 increments.
+    Sent2 = Sent1 + 0,
+
     tap_metrics(?LINE),
     %% send query now will fail because the resource is blocked.
     Insert = fun(Tab, Ref, Result) ->
@@ -658,7 +666,7 @@ t_query_counter_async_inflight_batch(_) ->
         %% +2 because the tmp_query above will be retried and succeed
         %% this time.
         WindowSize + 2,
-        10_000
+        5_000
     ),
     ?assertMatch(ok, emqx_resource:simple_sync_query(?ID, resume)),
     tap_metrics(?LINE),
@@ -666,8 +674,8 @@ t_query_counter_async_inflight_batch(_) ->
     %% since the previous tmp_query was enqueued to be retried, we
     %% take it again from the table; this time, it should have
     %% succeeded.
-    ?assertMatch([{tmp_query, ok}], ets:take(Tab0, tmp_query)),
-    ?assertEqual(NumMsgs + BatchSize, ets:info(Tab0, size), #{tab => ets:tab2list(Tab0)}),
+    ?assertEqual([{tmp_query, ok}], ets:take(Tab0, tmp_query)),
+    ?assertEqual(Sent2, ets:info(Tab0, size), #{tab => ets:tab2list(Tab0)}),
     tap_metrics(?LINE),
 
     %% send async query, this time everything should be ok.
@@ -679,7 +687,7 @@ t_query_counter_async_inflight_batch(_) ->
             {ok, SRef} = snabbkaffe:subscribe(
                 ?match_event(#{?snk_kind := connector_demo_inc_counter_async}),
                 NumBatches1,
-                10_000
+                5_000
             ),
             inc_counter_in_parallel(NumMsgs1, ReqOpts),
             {ok, _} = snabbkaffe:receive_events(SRef),
@@ -693,11 +701,10 @@ t_query_counter_async_inflight_batch(_) ->
             )
         end
     ),
-    ?assertEqual(
-        NumMsgs + BatchSize + NumMsgs1,
-        ets:info(Tab0, size),
-        #{tab => ets:tab2list(Tab0)}
-    ),
+
+    Sent3 = Sent2 + NumMsgs1,
+
+    ?assertEqual(Sent3, ets:info(Tab0, size), #{tab => ets:tab2list(Tab0)}),
     tap_metrics(?LINE),
 
     %% block the resource
@@ -720,22 +727,23 @@ t_query_counter_async_inflight_batch(_) ->
         end
     ),
 
+    Sent4 = Sent3 + NumMsgs + BatchSize,
+
     %% this will block the resource_worker
     ok = emqx_resource:query(?ID, {inc_counter, 1}),
 
-    Sent = NumMsgs + BatchSize + NumMsgs1 + NumMsgs,
     {ok, SRef1} = snabbkaffe:subscribe(
         ?match_event(#{?snk_kind := connector_demo_inc_counter_async}),
-        WindowSize,
-        10_000
+        WindowSize + 1,
+        5_000
     ),
     ?assertMatch(ok, emqx_resource:simple_sync_query(?ID, resume)),
     {ok, _} = snabbkaffe:receive_events(SRef1),
-    ?assertEqual(Sent, ets:info(Tab0, size), #{tab => ets:tab2list(Tab0)}),
+    ?assertEqual(Sent4, ets:info(Tab0, size), #{tab => ets:tab2list(Tab0)}),
 
     {ok, Counter} = emqx_resource:simple_sync_query(?ID, get_counter),
-    ct:pal("get_counter: ~p, sent: ~p", [Counter, Sent]),
-    ?assert(Sent =< Counter),
+    ct:pal("get_counter: ~p, sent: ~p", [Counter, Sent4]),
+    ?assert(Sent4 =< Counter),
 
     %% give the metrics some time to stabilize.
     ct:sleep(1000),