XR Graphics: Quad View: when using camera stacking the inner view does not show main camera

Steps to reproduce:

1.  set up scene with 2 cameras stacked (attached project has this set up)
   1. note my main camera is tagged as base camera and the stacked as overlay
   2. I have attached a head tracking script to the main camera but not the overlay camera but I'd think this shouldn't much matter?
2.  enabled quad view and meta XR
3. build and run on Quest device

Actual results: 

Only the stacked camera is displaying in the inner view.

Expected results: 

both cameras displayed in inner view

Reproducible with versions: 

6.0007a06

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS):

Notes:

• I thought I was using this same project / scene a few weeks ago with quad view and this wasn't the case but I'm not entirely sure and didn't check older versions yet (sorry) so not marking as regression but it may be.