It looks like the latest gnome-shell fixed the issue for me:
apt policy gnome-shell
gnome-shell:
Installed: 3.34.3-1ubuntu1
Candidate: 3.34.3-1ubuntu1
Version table:
*** 3.34.3-1ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
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https://bugs.launchpad.net/bugs/1858120
Title:
Graphical corruption Intel HD Graphics 630 when using Firefox nightly
in Wayland mode
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