> The default session type is meant to be remembered. So GDM's preference of 
> default should actually be irrelevant if the user has ever logged in prior to 
> the kernel update.
> 
> If previous successful logins used Xorg and suddenly it's going to Wayland 
> then perhaps the attempt to use Xorg is crashing and Wayland is only the 
> fallback?

I have another explanation for that:
gdm/accounts-daemon are not saving the last user session when there is only one 
available session. So if Wayland was disabled previously and is enabled+default 
now, you would see the session switch.

I verified that on my machine.

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https://bugs.launchpad.net/bugs/2080498

Title:
  Default session type changed from Xorg to Wayland in some installs of
  22.04 on Nvidia hybrids since kernel 6.8

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