The mentioned upstream issue already applies on the pyqt5-dependent firewall-applet package that is in Debian (for wayland). So an update to pyqt6 does not regress. Please make the update happen. I could provide a patch but it is trivial to rename the Depends: python3-pyqt5, python3-dbus.mainloop.pyqt5 to Depends: python3-pyqt6, python3-dbus.mainloop.pyqt6
