Check if you have these Nvidia-related lines in /usr/lib/udev/rules.d/61-gdm.rules. If you do, comment them out:
disable Wayland on Hi1710 chipsets
ATTR{vendor}=="0x19e5", ATTR{device}=="0x1711", RUN+="/usr/lib/gdm-runtime-config set daemon WaylandEnable false"
disable Wayland when using the proprietary nvidia driver
DRIVER=="nvidia", RUN+="/usr/lib/gdm-runtime-config set daemon WaylandEnable false"
disable Wayland if modesetting is disabled
IMPORT{cmdline}="nomodeset", RUN+="/usr/lib/gdm-runtime-config set daemon WaylandEnable false"