Bug Compositor Tool + Camera Space UI

I had posted this in the beta graphics sub-forum, ultimately I think this may have, however, gotten lost in an ever prevalent issue of, there are too many "HDRP" subforums.

Using the new Compositor tool, utilizing UI is non-supported.

Camera Space UI was the endeavored use case; however the UI elements don't display.
World Space UI Shows up in editor, but not in Build.


Current Use case:
3 Cameras.
- 1 Camera for background scene components that should receive post processing.
- 1 Camera for external Capture card sources to not be post processed, but should still render the bloom overlay from the "stacked" camera composite.
- 1 Camera for foreground scene based objects and rendering that should receive post process. (Note, bloom fx on this camera should overlay onto the non post processed camera)

Current Problems:
- UI is non-supported
- Tone mapping affects regions that are alpha-ed
- Non-UI related, it would seem dealing with 3 camera based layers break down at times with an entire layer flickering.

Used versions:
-Unity 2020.2.0a21
-HDRP 10.0.0-preview.27

Original forum thread in the beta section: https://forum.unity.com/threads/hdrp-compositor-tool-ui.947721/

 

Sorry for the delay @Soaryn, I'll push this over for you.