I have tried to implement reflection with webxr. This works well on desktop browser, but when tested on my Oculus Quest 1 it is flickering strongly. Here is an example which reproduce the problem:
Not sure why you think I am not available
The oculus seems to have a bit of a hard time when setting blur kernel. Try without, and it works as expected - reflecting_ground | Babylon.js Playground (babylonjs.com)
I will try contacting them and see if they have any input regarding that.
Yep thank you @RaananW . This works!