Cannot terminate video calls

[aoloe]

Steps to reproduce

1. In the past I have started video calls.
2. Now, two widgets are stuck at the top and I can't remove them.
3. As the adminstrator of the room I can terminate the call, but they show up again after a few seconds.
   
4. No message in the timeline.
5. Other people also see the widgets at the top.
6. From the Browser I can't start any call anymore.
7. From the tablet I can create new calls and stop them. They show in the timeline of the Desktop (started and ended)

Outcome

What did you expect?

I expect to be able to stop the existing call

What happened instead?

The call shows up again and can't be stopped.

Operating system

No response

Browser information

Firefox developer edition (it has been happening for some time now)

URL for webapp

https://app.element.io/#/room/#ots-zh:matrix.org

Application version

No response

Homeserver

No response

Will you send logs?

Yes

[t3chguy]

This looks like network or server issues:

2023-03-09T15:54:19.859Z E /sync error %s fetch failed: NetworkError when attempting to fetch resource.
s@https://app.element.io/bundles/e983d51f78647cc601c0/vendors~init.js:2:1259225
requestOtherUrl@https://app.element.io/bundles/e983d51f78647cc601c0/vendors~init.js:2:3563279

You'd need to seek help from your homeserver operator

[aoloe]

for future reference (if this tickets ever gets referenced in search engines...):

it seems to be an issue with the web client: clearing the cache and reload (in the user settings > help & about) removed the video calls.

[t3chguy]

Clearing cache & reload is also a workaround for a server's broken sync behaviour