Volume option disappears along with NullReferenceException on assigning Camera value in Render Pipeline Debug.

Steps to repro:
1. Create a new HDRP project.
2. Windows > Render Pipeline > Render Pipeline Debug.
3. Volume > Component > Sky/Gradient Sky.
4. Camera > Editor Camera/Main Camera.

Actual Result:
-Volume option should not disappear.
-No error in the console.

Expected Result:
Default Sprites are present in Asset selector window.

Reproducible in:
2021.1.0a4, 2021.1.0a1 with Package version 10.1.0.

Working Fine in:
2020.2.0b10 with Package Version 10.1.0.

Environment:
Occurring on Windows 10 & mac 10.15.

Note: Please find attached stacktrace.