Blue highlight is not available when changes are made to Contribute GI, Receive GI, Lightmap parameters and Optimize realtime UVs in Mesh Renderer prefab instance. Refer the attached screenshot

Steps to reproduce:
1) Create a new project
2) Create cube primitive > Make a prefab by dragging to Project Browser
3) Select Cube in Hierarchy, make changes to Contribute GI, Receive GI, Lightmap parameters and Optimize realtime UVs.

Actual result: Blue highlight is not available for these fields.
Expected result: Blue highlight should be available for the above fields.

Occurring in: 2020.0a1, 2019.3.0b1, 2019.2.0f1, 2019.1.10f1

Note: These parameters are introduced in 2019.1