Here are a few posts I found which appear to be talking about the same issue:
https://forums.unrealengine.com/t/hdri-backdrop-cause-graphical-glitches-in-vr/684951
https://communityforums.atmeta.com/t5/Get-Help/Quest-2-has-static-lines/td-p/979097
https://forum.egosoft.com/viewtopic.php?t=438670