How to reproduce:
1. Open the user's attached project
2. Go to Window -> Asset Management -> Addressables -> Groups
3. Dock the newly opened Addressables Groups window by dragging it to an Editor section
4. Select one of the Prefabs from the Assets folder in the Project window and drag it into the Hierarchy window
5. Open the Prefab Asset by clicking the small arrow next to its name in the Hierarchy window
6. In the Inspector view, alter, add, remove or uncheck any of the components of the Prefab

Expected result: Inspector window properties remain visible
Actual result: Inspector window properties become hidden

Reproducible with: 1.18.9, 1.18.15 (2019.4.29f1, 2020.3.17f1, 2021.1.18f1, 2021.2.0b9, 2022.1.0a6)
Not reproducible with: 1.18.4 (2019.4.29f1, 2020.3.17f1, 2021.1.18f1, 2021.2.0b9, 2022.1.0a6)

Notes: issue reproduces when Auto Save is checked for the Prefab, or when Save is pressed after making changes