This Unity version will no longer be receiving patch updates.
Reproduction steps:
1. Open the attached project "CustomLitBug.zip"
2. Go to Assets > Scenes and open "SampleScene" and observe the correct rendering for the "Box_001" GameObject for both Scene view and Game view.
3. Go to Assets and select the "Box_001" Prefab, observe the Inspector preview window
4. Open the "Box_001" Prefab and observe the Prefab editing mode
Expected result: Prefab is rendered with lit lighting condition in Prefab editing mode and in the inspector window
Actual result: Prefab is rendered with a black output lighting condition in Prefab editing mode and in the inspector window