I use an Atoto head unit ( android 8 ) in my car and the latest PA as default for mp3. If PA is playing and I open the radio app and PA is in the background, the playback of the mp3 is not stopped instantly. It takes about a minute for PA to stop playing. You can hear the radio in the background. I have tried to play with the audio focus settings, but I can't get it to work well, no matter if I try short focus change or stop during call. Strange thing is, sometimes it is working as it should be. It works for calls.
No problem if I use gonemad or black player.
Vid 20210926 170300-1.m4v