Backgrounding app in 1:1 call kills audio stream

[RedChops]

Steps to reproduce

1. Start 1:1 call from anywhere in app
2. Switch apps or turn off screen

Outcome

What did you expect?

Call should continue as normal

What happened instead?

Audio stops transmitting, will not resume even when bringing the app back to the foreground

Your phone model

iPhone 13

Operating system version

15.6.1

Application version

1.9.7

Homeserver

Synapse 1.68.0

Will you send logs?

Yes

[RedChops]

I was able to reproduce this with 100% consistency just yesterday. Today however, I force killed the app to capture a clean log and now I cannot get the audio stream to die. Suggests to me that perhaps a lack of priority will allow iOS to kill the app in background, even in a call, if the app has been running for a while