Tapping alternating rooms can lead to ElX displaying a "Join Room" screen

[Avi0n]

Unsure if this related to SSS or not. Didn't try it before enabling SSS.

Steps to reproduce

1. On iPad, rapidly tap between two different rooms
2. See that you will get a "Preview is not available...Join Room" screen

Outcome

What did you expect?

To see my room's contents

What happened instead?

Got a "Join Room" screen

Your phone model

iPad Air 4th gen

Operating system version

iPadOS 18.0 RC

Application version

1.8.0 (122)

Homeserver

matrix.org

Will you send logs?

Yes

[ara4n]

this sounds very similar to #3031

[wrjlewis]

Also hitting this issue, posted a video internally (let me know if you want a link to it)

I don't need to tap rapidly for the issue to occur, and I generally see a noticeable delay when clicking into certain rooms.

I'm on build 709 and Synapse 1.115

[manuroe]

I think I have a way to reproduce it:

• Clear the cache
• Kill the app before all the whole room list is loaded
• Go offline
• Restart the app

The app displays room ids instead of room names for some and if you top one of them, you will get the "Join Room" screen.

This may be the same root race conditionon state events that leads to this particular bug on iOS. @ganfra and @Hywan are working on a batch for room id display bug, which translates into rooms with no name on Android.

[ganfra]

This is not the same issue than the "no name" one.
This one happens in non encrypted room where we need encryption info to create the timeline.
@jmartinesp is working on a fix in the rust sdk.

[ara4n]

had something very similar to this this morning; rageshaked

[jmartinesp]

This should be fixed by matrix-org/matrix-rust-sdk#4021, once merged.

[Hywan]

PR has been merged. Should we wait on an update of EX before closing this issue?

[Avi0n]

I ran into this issue again today on 1.8.5 (128) and sent logs.
Steps I took:

• Background EX
• Open EX and open Synapse Admins room
• Before it finishes loading all events, go back to room list
• Open Synapse Admins room again
• See "Join Room" screen