Sometimes Gnome packages in the Arch repos will have an “inconsistent looking” version number like this, but this is nothing to be concerned about, it is normal to see this from time to time. I would however not recommend holding back any core Gnome packages since partial updates will become problematic sooner than later, unless of course you know exactly what you are doing.
To make Wayland enabled in GDM (it should be the default fyi): open up a terminal using nano, micro, or whichever editor you fancy:/etc/gdm/custom.conf
In my case I’ll just use nano for this example:
sudo nano /etc/gdm/custom.conf
And make sure you have the following line looking like this:
# Uncomment the line below to force the login screen to use Xorg
Chances are maybe yours was uncommented so it was defaulting to Xorg. Just make sure you have a # before WaylandEnable=false and then save it. Log out or reboot and check the cog wheel in the bottom right of GDM while entering your password to see if you can access Wayland again and hopefully then you’ll be all set!