Override Indicator is missing for Constraint property under Rigidbody 2D in the inspector, Refer attached screenshot

Steps to Repro:
1. Create a new project
2. Hierarchy > Create > Create Empty
3. Inspector > Add Component > Rigidbody 2D
4. Drag and Drop GameObject to the Project window to make a prefab
5. GameObject > Inspector > Rigidbody 2D > Change properties value
6. Toggle Constraints position(X, Y, Z)

Actual result:
Blue highlight is not available for Constraints under Rigibody 2D

Expected result:
Blue highlights should be available for the Constraints under Rigidbody 2D

Reproducible in:
2020.2.0b6, 2020.1.7f1, 2019.4.10f1, 2018.4.27f1

Environment:
Occurring on Windows 10 & macOS 10.15.