Room messages not received on reconnection after app swipes out

Environment

• ejabberd version: 22.05 or 21.12
• Erlang version: Erlang (SMP,ASYNC_THREADS,HIPE) (BEAM) emulator version 10.6.4
• OS: Linux (Ubuntu)
• Installed from: source

Bug description

Pre-condition:

Alice is connected and subscribed to room X
Bob is connected and subscribed to room X
Alice and Bob can successfully exchange room messages on their mobile devices (Android)

Scenario:

1. Bob swipes out its app

ejabberd realises client's connection dropped:

2022-10-20 13:26:42.913919+00:00 [debug] Running hook c2s_closed: mod_stream_mgmt:c2s_closed/2
2022-10-20 13:26:42.914344+00:00 [info] (tls|<0.595.0>) Closing c2s connection for 001@192.168.1.28/MDAxQHRlc3Q=: Connection failed: connection closed; waiting 30 seconds for stream resumption

2. Alice sends a message to room X

3. Bob re-connects to the server WITHIN the resumption timeout

ejabberd logs:
2022-10-20 13:33:27.846812+00:00 [info] (<0.585.0>) Accepted connection hidden_by_ejabberd -> [::ffff:182.3.2.17]:5222
2022-10-20 13:33:27.894433+00:00 [info] (tls|<0.585.0>) Accepted c2s PLAIN authentication for 001@192.168.1.28 by external backend from hidden_by_ejabberd
2022-10-20 13:33:27.915918+00:00 [info] (tls|<0.585.0>) Opened c2s session for 001@192.168.1.28/MDAxQHRlc3Q=
2022-10-20 13:33:27.919572+00:00 [info] (unknown) Closing c2s session for 001@192.168.1.28/MDAxQHRlc3Q=: Stream closed by local host: Replaced by new connection (conflict)

Problem:

4. Bob doesn't receive the message sent by Alice in step 2

Expected behaviour:

Bob receives the message sent by Alice

Note that:

• if Bob after step 4, disconnects and reconnects to the server, he WILL receive the expected message.
• if Alice send the message AFTER the resumption timeout, Bob will receive the message at the first re-connection in step 3
• the issue doesn't seem to be reproducible with ejabberd 19.02
• the issue doesn't seem to be reproducible if client disables stream resumption

Have you ever experienced something similar ?

Thanks
Nakkore

Start by tracing mod_stream_mgmt:c2s_closed/2 and the stream-resumption path involved after the Android client is swiped out. Reproduce the stated room-message and reconnection sequence within the resumption timeout, then verify that Bob receives Alice's message on the first reconnection while stream resumption remains enabled.