Rigidbody component is shown in prefab but not in its instance when unapplied Joint component is removed. Refer the attached video

Steps to reproduce
1) Create a new project
2) Create a Cube > Make a Prefab by dragging to Project
3) Add Configurable Joint to Cube prefab instance
4) Add Rigidbody to Cube prefab
5) Remove Configurable joint and dependent Rigidbody component from Cube prefab instance
6) Select Cube Prefab

Actual result: Rigidbody component is available in Cube prefab but not shown in its prefab instance. It is also not shown in Overrides window

Expected result: Rigidbody component should be shown in prefab instance as well

Workaround: Make changes in Rigidbody component in Cube Prefab. Component is then shown in Prefab instance as well

Occurring in: 2020.2.0a15, 2020.2.0b14, 2021.1.0a8

Working fine in: 2020.2.0a14

Environment: Both Windows and Mac