New Android Video Player - Sound doesn't stop after stopping video

So saw there was a new video player in the most recent Android Client release (v3.17.0). Went to try it out. Played an MKV file (Tried an AVI but those still don’t work) and everything looked great. Video/Audio worked great.

Then I stopped the video. The sound kept playing.

So I closed the whole Nextcloud Client. Still playing.

Had to reboot my phone (Samsung Galaxy S9+) to get it to stop.

After reboot, tried again with a different MKV file. Same issue. Had to reboot phone to get it to stop playing audio.

Any advice on how to fix this?