Gamobject is not getting removed from "Look Dev" window even if it is deleted from the "Hierarchy" window, refer the attached video.

Steps to repro:
1. Create a new project with HDRP Template
2. Upgrade High Definition RP Package to 7.2.1
3. Window > Render Pipeline > Look Dev
4. Hierarchy > Create > 3D Object > Cube
5. Drag Cube to "Look Dev" window
6. Delete Cube from the Hierarchy window

Actual Result:
Gameobject not removed from "Look Dev" window even if it is deleted from the Hierarchy window

Expected Result:
Gameobject is removed from "Look Dev" window when it is deleted from Hierarchy window

Note: "Look Dev" window is introduced in Unity 2019.3.0a12

Reproducible in:
2020.1.0a24, 2019.3.2f1, 2019.3.0a12

Package version found: 7.2.1, 7.1.8, 7.1.7, 7.1.6, 7.1.1, 7.0.0

Environment:
Windows 10 and macOS 10.14