Build: v3 836, 838, 839
Device: Nokia 6.1 (2018)
Android Version: Pie
When volume levels is set to something other than system default, changing volume works as expected in the app but becomes bugged outside the app.
Pressing the volume up key increases the volume but the second volume slider for chromecast is increased at the same time.
Pressing the volume down key does nothing because both volume sliders become stuck.
I can still manually adjust media volume in the android sound settings.
The only way to fix this is to either force quit Poweramp or stop the player service under developer options -> running services -> Poweramp.
The problem appeared after the June security update but that could be a coincidence.