Reproduction steps:
1. Open the attached “BugRepro” project
2. In the Lighting window (Window > Rendering > Lighting), select Adaptive Probe Volumes tab
3. Make sure Baking Mode is set to “Baking Set” and Current Baking Set is set to “Assets/Scenes/SampleScene/New Baking Set” Baking Set
4. In the Scenes in Baking Set list, remove the “SampleScene” Scene
5. Add the “Assets/Scenes/SampleScene” Scene back to the Scenes in Baking Set list

Expected result: The Scene is added to the list
Actual result: The Scene does not get added to the list

Reproducible with: 6000.0.3f1
Couldn't test with: 2021.3.38f1, 2022.3.30f1 (these versions do not have Probe Volume Baking Set type)

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

Note: If you restart the Editor, you can add the Scene to the list, but this produces various errors in the Console