[BUG] Scene depth fog using post process for VR


I’ve been having a few issues regarding setting up a stylised post processing material that uses scene depth for multiple colour gradients and fog intensities. It seems to work pretty well in the view-port but when trying it out in the VR headset it completely bug’s out.
Now, I have thought use of instanced stereo rendering could be problem but I sampled turning it off and it was not the culprit. Is there something else I could potentially be missing or is this feature just not supported for VR currently?

Running a differed rendering pipeline with TAA.

Here are some screenshots -