Camera/Microphone not released in dial-out room on hangup

[!TIP]

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Steps to reproduce

1. Have a SIP-Dialout room
2. Start a call, you hear the internal client (sip bridge) joining)
3. You hang up (Note: The call did not actually arrive at the phone, so something is wrong on the SIP side)

Expected behaviour

Call is ended, camera/microphone is released

Actual behaviour

First I end up in an "intermediate" state, my own avatar starts spinning, but I still see the call screen. Then I press "End call" again, and I leave the call screen now, but camera/microphone is retained.

I think it is due to the dialout API hanging: v2.php/apps/spreed/api/v4/call/.../dialout/.... This never finishes and eventually ends up in a 500. I guess this should be cancelled on leaving?

Talk app

Talk app version: 34 on c.nc.c