How to reproduce:
1. Open the attached project "DirectPrefabEditing.zip"
2. Select Assets/GameObject.prefab
3. Edit any Position field in the Inspector window
Expected results: Nothing is thrown in the Console window
Actual results: "this == null : -1000" is thrown in the Console window
Reproducible with: 2021.3.30f1, 2022.3.10f1, 2023.1.14f1, 2023.2.0b10, 2023.3.0a6
Reproducible on: Windows 10 22H2
Not reproducible on: No other environment tested