Audio playback of other apps doesn't resume after listening to a voice message

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• I am submitting a bug report for existing functionality that does not work as intended
• This isn't a feature request or a discussion topic

Bug description

If I listen to music or other audio in external apps (Spotify, Audible, ...) and then start listening to a voice message the audio playback (obviously) stops. But after finishing the voice message the audio playback of the other apps don't get resumed. Even on the lock screen is the playback not available anymore.

Steps to reproduce

• Start listening to music e.g. on Spotify
• Start listening to an voice message
• Check Lock Screen

Actual result: Music/Audio of external apps doesn't get resumed

Expected result: The voice message ends and audio playback resumes

Screenshots

Before listening to a voice message:

After listening to a voice message:

Device info

Device: iPhone SE 2020

iOS version: 15.1

Signal version: 5.26.5.0

Link to debug log

https://debuglogs.org/ecfede2a6191fbdee2517b704d2a8cffddd2fa8dcfcd807524f5237408e34be9.zip

No source file or test is named in the report. Start by reproducing the issue on the reported iPhone SE with iOS 15.1 while checking the voice-message playback flow and external audio state. Done means audio from Spotify or Audible resumes after the voice message and remains available from the lock screen.