Disappearing popup menu bars (damage failure?)
If you create 10+ profiles in gnome-terminal, shrink the terminal to a small size, and click the profile selector drop-down, pieces of the menu disappear when you try and move the pointer over them. Moving the top-level window restores them, but moving again will make it disappear.
You need to create profiles to get the drop-down to appear in the first place, and you need lots of them otherwise the menu isn't big enough.
https://vimeo.com/395979296 is a demonstration.
Mutter 3.34.3 on an Intel NUC in a Wayland session.
@jadahl on IRC could also replicate with similar hardware.