GTK2 seems to be broken now for me. Here’s some screenshots of broken apps:
Basically, certain UI elements (a lot) don’t use the system theme. This occurs on all gtk themes, including Pocillo ;( Light themes are usable at least, but still don’t use the system GTK widgets in those places.
This makes UB unusable. I ran into a (similar?) problem in Manjaro with gtk3, though: https://forum.manjaro.org/t/dark-gtk3-themes-broken/109968/16 PLEASE HELP