Screen position node in 4.22 no longer works as expected.
Confirmed in 4.23 Main @ CL 5806859
Sample project attached. (4.21, verify and then update to 4.22)
1. Create post-process material using ScreenPosition. (Example for outline PP mat attached as pastable material BP)
2. Apply post-process material in post-process volume.
3. In project settings: enable Instanced Stereo and restart engine.
4. Enable "Render CustomDepth" on a mesh to enable post process outline.
5. Play in VR preview
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-72551 in the post.