Android PlexAmp : Lock screen releases headset controls

Using bluetooth headset (apple airpods pro).

When I pause for anything past momentarily,
the ability to unpause is released and I must use the phone to start again.

Not sure if the fault is PlexAmp, Android, or the bluetooth headset.

Still seeing this with v3.2.1? If so, please make it happen and then share logs with me: Settings > Advanced > Debugging.