Bar Grid Around Edges of Lens After Updating App to Quest 3

Relatively new and almost completely self-taught UE5 user here.

I made this fan game back in June, but since I just got a Meta Quest 3 to replace my Quest 2, I decided to remove the need for PCVR.

Performance seems mostly okay, but there is a new black grid around the edge of the lens. It has never been an issue until today. In addition, some materials have become shades of black and gray, and some meshes aren’t rendering.

All can be seen in this video:

As mentioned, I am new and self-taught, so it is probably a very obvious solution. Any help would be much appreciated, and I will provide more info as needed.

After further testing, it appears that the black grid only shows up in the left lens.