Repro:

1. For convenience, download and import the attached repro project into 2020.1.0b5
2. Open the test Scene Scenes/LightOverlapMissing.unity
3. Complete a cheeky little bake just to ensure we're looking at a complete Scene
4. Look at the Scene View modes list. I've attached some screenshots of the view in Built-In and HDRP.

Observed:

There is a Scene View mode missing in HDRP: "Light Overlap".

Expected:

Light Overlap is also applicable in HDRP so should be available in the Scene View list. This is an important debug view when using Light Mode: Shadowmask. It's nearly impossible to diagnose issues such as fallback to Baked Lighting when overlapping analytical lights exceed the shadowmask array size without this Scene view.

If it is intended to have been moved to HDRP's debug window, I am unable to find it. I'd also have a strong preference that it did not move and instead remained next to the shadowmask Scene View mode.