thumbnails switch to blurhash and back again when timeline reloads

[ara4n]

Steps to reproduce

1. Open a room with images and start reading it
2. Thumbnails are visible…
3. …until the timeline reloads due to a SS refresh of some kind…
4. and the thumbnails you were just looking at get replaced by blurhashes
5. you then have to wait at least a second or so before the thumbnails unblur

Outcome

What did you expect?

given you were just looking at the thumbnail, you’d expect it to still be there, even if the timeline reloads, rather than it disappearing into a blur for a bit

Your phone model

No response

Operating system version

No response

Application version

783

Homeserver

No response

Will you send logs?

No

[pixlwave]

They're switching back to the unloaded state as the stable ID changes which is what the view's identity is tied to - we started using the stable ID rather than the upload URL to fix the issue where the local echo would flicker (#3525). That said, it sounds weird that it is taking a whole second to load, I would expect it to load immediately from the cache/store and simply flicker like the local echoes were doing.

Are you seeing this in both encrypted and unencrypted rooms?