@maxmp sorry for long reply. Here is a video with demonstration of this problem. I've tried to reinstall Poweramp, but it didn't help.
Link: https://dropmefiles.com/geIco
Poweramp build number: build-911-arm64-play [911004-cb218340]
Device model: Google Pixel 4a 5g
Android version: 12 (SPB4.210715.011)
Steps to reproduce:
1) Open Poweramp
2) Press play/pause many times
3) Face animations bug