The camera preview window is missing in the Scene with URP Template.

Steps to repro:
1. Create a new URP Template Project.
2. Create a new scene.
3. Select "Main Camera" in Hierarchy.

Actual Result:
The camera preview window is missing in the scene view.

Expected Result:
The camera preview window is present in the scene view.

Reproducible in:
2020.1.0a19, 2020.1.0a14.

Working Fine in:
2020.1.0a13, 2019.3.0f6.

Tested on Package Version: 7.1.7, 7.1.1.

Environment:
Occurring on Windows & Mac.