Poweramp build number (available in Poweramp Settings / About): build-905-arm64-play [905004-96b6d050]
Your device model: Google Pixel 4a
Your Android version: Android 11
Your custom ROM name/version (if you're on custom ROM): Issue occurs on stock OS (Pixel, Android 11) and LineageOS 18
Steps to reproduce:
Open Poweramp and play any song
Use hardware volume buttons to change volume
Expected: Media volume icon will appear (music note) in volume slider
Actual: Cast volume icon appears (cast icon) in volume slider
NOTE: In Settings > Audio > Output, the output engine I have selected is AAudio. I have tested the other output options as well, and all of them cause the system to detect the volume being output from Poweramp as a cast device when nothing is being cast in the background. I don't use casting at all.
Please see this video example: https://streamable.com/1v1xf7