How to reproduce:
1. Open the attached "1284595_Repro" project
2. Open the Scene "SampleScene"
3. Open the "Comp" Script (found in the Assets folder) and uncomment the 4th line
4. Drag the "Cube" GameObject from the Hierarchy to the Project window to make it into a Prefab
5. Open the Inspector (Window->General->Inspector)
6. In the Hierarchy select the "Cube" GameObject
7. In the Inspector delete the "Comp" Script and Rigidbody Components
8. Enter the Play Mode

Expected results: The Rigidbody Component is not added
Actual results: The Rigidbody Component is added, the "Error removing component when merging Prefab changes: Can't remove Rigidbody because Comp (Script) depends on it" error is thrown

Reproducible with: 2020.2.0a19, 2020.2.0b11, 2021.1.0a5
Not reproducible with: 2018.4.29f1, 2019.4.14f1, 2020.1.13f1, 2020.2.0a18

Notes:
- If a Component was added to the GameObject before it was turned into the Prefab the issue will not occur
- Any instance of the Prefab will have this issue