Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scenes/BootScene.unity” Scene
3. Enter the Play Mode
4. Click the Button with the text “Load Sample Scene“
5. Observe that the Scene changes colors
6. Click the Button with the text “Load Additive Scene“
7. Observe that the Scene does not change color anymore
8. Click the Button with the text “Unload Additive Scene“

Expected result: Scene continues to change colors
Actual result: Scene does not change color

Reproducible with: 2022.3.62f1, 6000.0.55f1, 6000.2.2f1, 6000.3.0a6

Reproducible on:
Play Mode
Windows Standalone Player

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested