Blue highlight is missing on making changes in Projection of Main Camera prefab

Steps to Reproduce:

1. Create a new Project
2. Create a prefab of Hierarchy > Main Camera
3. Change projection Type to Orthographic

Expected Result:
Blue highlight appears on the left border of the Projection

Actual Result:
Blue highlight is missing on making changes in Projection of the Main Camera

Reproducible on: 2020.1.0a12, 2019.3.0b10, 2018.4.12f1

Environment: Windows 10 and Mac 10.14