This is correct behaviour because Wayland is not yet stable in the
presence of an Nvidia proprietary driver. We hope to fix that by Ubuntu
24.10.

The original intention was to enable Wayland for hybrid systems:

gdm3 (42.0-1ubuntu7) jammy; urgency=medium

  [ Alberto Milone ]
  * Default to Wayland for hybrid systems with Nvidia graphics drivers.
    Default to Xorg but offer Wayland with the gear button on the login
    screen for non-hybrid systems with Nvidia graphics drivers. (LP: #1968929)

 -- Jeremy Bicha <jbi...@ubuntu.com>  Thu, 21 Apr 2022 06:32:09 -0400

but even that turned out to be unreliable. And added to that there was
an uninitialized variable in gdm3(?) we fixed a year or two ago which
was also causing the session selection to not follow the udev rules.

So it's all very complicated. Overall we would prefer Nvidia systems DID
NOT show a Wayland login option yet, but since you've figured out how to
enable it, please be aware of the bug list:

https://bugs.launchpad.net/ubuntu/+bugs?field.tag=nvidia-wayland

** Changed in: gdm3 (Ubuntu)
       Status: New => Won't Fix

** Tags added: noble nvidia

-- 
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https://bugs.launchpad.net/bugs/2062128

Title:
  Booting with nvidia proprietary drivers 550.67 results in gdm3 being
  displayed on X11 rather than Wayland

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