With x11-wm/mutter-43.3 (current stable), I'm encountering a window focusing akin to the one described in: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2848 43.4 does contains the fix and updating to this version resolves it for me.
Let's convert this into a stable request.
amd64 done
arm64 done
x86 done all arches done