I installed the nvidia-beta drivers (Arch) and tested out Starfield. All is good. Then next time I try to startx, I get X failed to start etc.
Did you reboot after changing to the beta driver? If you did not you were still using the previously installed nvidia driver, unless you manually reloaded the nvidia kernel modules via rmmod and modprobe (I’d discourage doing this though, rebooting is way less error prone)