Closing Amarok with playback volume set at 100% and then reopening has volume set at 0%
STEPS TO REPRODUCE
1. Set playback volume at 100%
2. Exit Amarok
3. Open Amarok
Playback volume is at 0%
Playback volume is at 100%
(available in About System)
Ubuntu 18.04.5 LTS Sever with xfce GUI
KDE Plasma Version: Unknown
KDE Frameworks Version: Unknown
Qt Version: Unknown
I can't reproduce this here at all, might be specific to your installation.
I'm seeing this sometimes too - but I'm not sure what is provoking it - or how to reliably show the bug.
Reopening based on Roberts comment