Can you test if it works fully, when only one monitor is plugged in? If it does, that narrows it down to a known Gnome bug within Mutter compositor.
I highly recommend sticking to Xorg - Wayland is still shaky on Nvidia.
If the above has same symptoms, try the grub parameter nvidia-drm.modeset=1
In your case, do you not use nomodeset. Just the above parameter.
Once you have added nvidia-drm.modeset=1 and saved the file, please do not forget to run sudo update-grub