unity_SpecCube0 is not set when there are no GameObjects in the Scene

How to reproduce:
1. Open the user-attached project “Bugs2023”
2. Open the “SampleScene” scene and observe the Scene view
3. In the Hierarchy right-click to add any 3D GameObject
4. Observe the Scene view

Expected results: The scene view is not black and looks the same before and after adding the GameObject
Actual results: The scene view is black before adding the GameObject and renders a background after adding it

Reproducible with: 2021.3.37f1, 2022.3.23f1, 2023.2.17f1, 6000.0.0b14

Reproducible on: Windows 11 Pro
Not reproducible on: No other environment tested

Note: Deleting the GameObject doesn’t make the scene black again