Camera Render type changes automatically to Base in Overlay Camera preset after creating its preset asset.

Steps to repro:
1. Create a new project with the URP template > Create New Scene.
2. GameObject > Camera > Change Render Type to Overlay.
3. Create a preset of Overlay camera.

Actual Result:
Camera Render type changes to Base.

Expected Result:
Camera Render type should be Overlay.

Reproducible in:
2020.2.0a9, 2020.1.0b8, 2019.3.0f6 with Package Version: 9.0.0, 8.0.1, 7.3.1, 7.2.1, 7.2.0.

Note: Overlay Render type is introduced in Package Version: 7.2.0

Environment:
Occurring on Windows 10 & Mac 10.15.