yeah i'm having the same bug, i was with some live open in youtube in picture in picture mode, with the volume at 50%, then i pressed play at a random video on twitter and i lower the youtube to like 10% some seconds later just boom, back to 50%
Sorry for the reply, but I have encountered the same error as you just now and your post seems to be the only one regarding this issue. I hope it gets more traction, so this issue can be solved for all of us.