I get a warning when compiling emacs from source with the pgtk flag telling me about a known bug in my version of gtk that causes problems when opening and closing multiple emacs instances. Do you know anything about this? In particular would it be resolved by switching to the snap?

I downloaded the source code for emacs and compiling it locally with the --with-pgtk flag. (And --with-native-compilation for better performance)

That made my life improve a lot.