The fix is…
sudo pacman -U /var/cache/pacman/pkg/gtk3-1:3.24.30-2-x86_64.pkg.tar.zst
Or whatever most recent version is in your cache. Don’t use gtk3 1:3.24.30+62+g8d04980f38-2
This is problem on Arch & all Arch derived distros. Manjaro, EndeavourOS, …