I created this bug report. Back then I gave up on 5.4 after I saw the problems involved. Now, I’ve been catching up on all the activity here… Thank you so much for so profound testing and patching!
Have you or anyone else tested that shadows (both dynamic and static and ideally with stationary light) work in UE5.5 on Quest standalone? (i.e. Instanced stereo, Forward rendering, and CSM). I have them kind of working on UE5.3 but I had to make Direct light movable instead of stationary and this affects performance.