When you copy over your monitor config, are you correcting the ownership/permissions?
The little scriptlet I made to combat a previous nvidia/wayland multi-monitor headache boils down to:
sudo cp $HOME/.config/monitors.xml /var/lib/gdm/.config/
sudo chown gdm:gdm /var/lib/gdm/.config/monitors.xml
Maybe double check if GDM is ignoring wayland as well, I’ve definitely had that happen in the past too.
I just worry if that did happen, that the people puppeteering Trump would be actively using that moment of celebration to push through some other Weekend at Burnies style scenario with Vance.