Come to think of it, a more likely explanation is that this is part of radeon bug 1841718. Not sure why I didn't consider that before.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1845802 Title: [radeon] Corrupt/skewed gnome-shell panel rendering To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1845802/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs