Rendered camera on top of the other buggy in HDRP

Hi!

I need to render a second camera (cam2) on top of the main one, with a different culling mask to draw UI element through everything else.

The cam2 setup is:
- no background,
- only the UI layer in the culling mask,
- same target display,
- superior Depth (main camera is 0, cam2 is 1).

Both camera have a TrackedPoseDriver component with the same parameters (center eye). Everything was working fine with this setup in built-in rendering. Now I've switched in HDRP, I've got bugs.



Each sphere should appear in front of the cubes, being rendered at a superior depth. This fails in must situations. Also, the line of sphere is duplicated with an horizontal offset.

On the next screenshots, I've only rendered the cam2 on a single eye with the parameter Camera => XR => TargetEye. The spheres are drawn on both eyes (but no offset here) and the culling is ok only for the right eye when I target the right eye.



Again, this setup worked just fine in 2019.4 built-in rendering. This is made with 2019.4.6, HDRP 7.3.1, XR plugin Management 3.2.13 and OpenVR descktop 2.0.5

How to solve this?