Reproduction steps:
1. Open the attached “Repro.zip” project
2. Open the “Assets/GameObject.prefab” in Prefab mode by double-clicking it in the Project window
3. Enter the Play Mode
Expected result: Editor enters the Play Mode
Actual result: A “Risk of unwanted modifications” pop-up appears
Reproducible with: 2021.3.32f1, 2022.3.14f1, 2023.2.1f1, 2023.3.0a15
Reproducible on: Windows 10 Pro (22H2)
Not reproducible on: No other environment tested