Upgraded to beta 7.9.2, o!mpd still plays fine, didn’t see any changes in any config files.
Installed kodi, reboot and o!mpd is unable to play, more details in new thread https://dietpi.com/forum/t/rpi4b-v8-7-9-2-beta-bossdac-mpd-stopped-working-after-kodi-19-3-install/6047/1