Video playback stops when adjusting volume

Description of the issue:
Video playback stops when adjusting volume. Player can be on youtube/vimeo/etc.

Expected result:
Change of volume, but not stopping video playback.

Reproduces how often:

Operating System and Brave Version(See the About Brave page in the main menu):
Version 1.18.78 Chromium: 87.0.4280.141 (Official Build) (64-bit)
Ubuntu 20.10

Additional Information:
I don’t remember exactly when, but I guess it started this behaviour in v85 or v86. Before it wasn’t an issue.

I disabled all extensions but the problem persisted. On a different machine with the same software setup I had no problems with playback when adjusting audio volume. Because I also couldn’t remove my sync chain on the afflicted machine, I decided to remove the .config dir and start anew. Now playback keeps running while adjusting volume.