Reset functionality does not work on Custom Render Texture

Steps to Repro:

1. Create a new Project
2. Project > right-click > Create > Custom Render Texture
3. Change all property values in New Custom Render Texture > Inspector
4. Burger button > Reset

Expected Result:
Default values should be set

Actual Result:
Reset functionality does not work

Reproducible on: 2021.1.0a1, 2020.2.0b8, 2020.1.10f1, 2019.4.11f1

Environment: Windows 10 and Mac 10.15