Room with Disappearing messages shows notification - no message available

[moan0s]

Steps to reproduce

1. Use an account on a Synapse server that makes use of retention (purges messages)
2. Create a new room
3. 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"
}

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

Outcome

What did you expect?

The room looks as if there never was a message and no notification.

What happened instead?

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.

Operating system

Endeavour OS

Application version

Element version: 1.11.2 Olm version: 3.2.12

How did you install the app?

Endeavour OS community repo

Homeserver

https://synapse.hyteck.de

Will you send logs?

Yes

[turt2live]

Retention is not currently supported client-side.

See element-hq/element-meta#729