Repro is something like:
  • start playing album at home
  • maybe airplay from phone to Mac
  • stop playback in middle of album
  • force quit app or wait for it to be purged from memory
  • start car/carplay
  • open longplay in carplay
  • no "currently playing" indicator, and no way to resume existing album/session
  • pick up phone, open longplay app, and swipe from right edge to see current album/session and hit play button
I'm currently on iOS 17 beta, but this happens even on RC builds.
Edit: added step to force quit app as more consistent repro