How to reproduce:
1. Open the user's attached "case_1284799-Prefab-Rename-SoftLock" project
2. Open the Scene view (Window->General->Scene)
3. Double click on the "Prefab" Asset in the Project window to open it
4. Make sure that the Prefab Auto Save is unchecked (at the top right of the Scene view)
5. In the Project window select and rename the "Prefab" Asset to "a"
6. Select the Prefab in the Hierarchy
7. In the Inspector set the Transform Component Position x value to 1
8. At the top of the Scene view press the "Save" button
9. When a window pops-up select the "Rename File" option

Expected results: No errors are thrown
Actual results: The "EndLayoutGroup: BeginLayoutGroup must be called first." error is thrown

Reproducible with: 2020.1.0b9, 2020.1.14f1, 2020.2.0b11, 2021.1.0a6
Not reproducible with: 2018.4.29f1, 2019.4.15f1, 2020.1.0b8

Notes:
- At the 9th step any choice will lead to the same result
- Not reproducible on Mac