A bit offtopic but, but not complety as gnome is pioneer at bringing wayland and fractional scaling to us.
There is an issue in Firefox under wayland with fractional scaling for example set to 125% for me:
When klicking on the blue star symbol in the menu bar to edit a already set bookmark, the window is not drawn completely to the bottom. Don’t have time at the moment to check whether a bug report at mozilla already exists…