I know this is closed but I've been having this same issue for months as well. In fact I tried a different webcam from a different vendor and I see the same behaviour.
Linux 5.8.18-200.fc32.x86_64 #1 SMP Mon Nov 2 19:49:11 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
I know this is closed but I've been having this same issue for months as well. In fact I tried a different webcam from a different vendor and I see the same behaviour.
Linux 5.8.18- 200.fc32. x86_64 #1 SMP Mon Nov 2 19:49:11 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Just adding this for the record, thanks.