Msg entirely vanished by turning into the next sent msg

[ara4n]

Steps to reproduce

1. opened a room
2. sent a msg
3. sent another msg
4. watch in confusion as the first msg beautifully animates into the second msg, as if it was an edit - about the point that the remote echo of the first msg should have been received
5. double check that it was not an edit (it was not)
6. double check that i am sober (i am)
7. go back to roomlist
8. go back to room
9. now both msgs are visible.

screenshot of the missing msg:

screenshot having reopened the room:

rageshake has event & room ids

Outcome

What did you expect?

msgs not to disappear before my very eyes

What happened instead?

a beautiful dissolving animation as my msg vanished temporarily.

this is the second time i’ve seen this (previously on macos a few weeks back)

cc @bnjbvr as he’s looking at timeline and echo weirdness

Your phone model

No response

Operating system version

No response

Application version

690

Homeserver

No response

Will you send logs?

Yes

[bnjbvr]

The "turning into the next sent msg" part is worrying, as it indicates a "unique id" for a timeline item is not so unique, and has been shared with another timeline item. I've identified one possible cause of that issue in matrix-org/matrix-rust-sdk#3916, but there might be other more subtle failure modes for this.

[bnjbvr]

double check that i am sober (i am)

Need a blood sample to exclude auto-brewery syndrome hypothesis.