Room with Disappearing messages shows notification - no message available

[moan0s]

Maybe this is a upstream bug, if so should i report this to element?

Steps to reproduce

0. Use an account on a Synapse server that makes use of retention (purges messages)
1. Create a new room
2. Send an m.retention event with a small retention time (here one hour)

   {
   "type": "m.room.retention",
   "sender": "@xy:example.com",
   "content": {
   "max_lifetime": 3600000
   },
   "state_key": "",
   "origin_server_ts": 1641353041750,
   "unsigned": {
   "age": 17572771043
   },
   "event_id": "$7wf6WmAsADF56w3gPx-TSzeikYbeA-7kro77rT7nE",
   "room_id": "!ABCDEyfgmxxaqWTULn:example.com"
   }

3. Send some messages
4. Log out and log in after messages have been purged (depends on server configuration).

What happens

Now you can see the room where you activated disappearing messages and see a notification (the small white dot). But the room itself is empty as all messages have been purged and there is no way to mark this room as read.

Expected result

Room looks like there never was a message.

[su-ex]

This is very likely upstream, there's nothing changed in this regard compared to Element. I didn't test this though, so probably you should test with Element as well before reporting to them.

[github-actions[bot]]

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