I also have some issues with the bluetooth buttons. The volume up/down buttons work fine, the main BT button also pauses/resumes playback correctly. The main issue is that, with the music paused, when I "long press" the volume up button to activate the Google Assistant, both the google assistant activates AND Poweramp resumes playback, and immediately shuts off the assistant voice recognition. Basically, I'm unable to use the google assistant with my bluetooth headset connected (for me, one of the main times that it is actually useful).
I have tried to play with the bluetooth settings in