Steps to reproduce:
1. Open the attached “IN-125039”
2. In the Project window, right-click the “Cube.prefab” asset
3. Click on “Convert To FBX Prefab Variant...” from the context menu
4. Observe the Console window
Actual result: NullReferenceException error is thrown and the prefab conversion fails
Expected result: No errors are thrown and the prefab is converted
Reproducible with: 4.2.1 (2023.1.0a17), 5.1.5 (6000.0.62f1, 6000.2.13f1, 6000.3.0f1, 6000.4.0a5, 6000.5.0a1)
Reproducible on: Windows 11
Not reproducible on: No other environment tested