The platform in specific is the Steam Deck. Usage of PCVR support over WiVRn is not necessary to reproduce the issue. I have used every single method I can think of to fix issues and still nothing fixes this.

Step 1: open a world, step 2, open your menu and squint at the icons, pictures, and other things that are now suddenly really low quality.

Better yet, step 1, go to a world with a reasonable mirror quality, step 2, look as your avatar loses quality as you walk backwards.

This issue has really only become noticeable with the most recent patch of the game.