How to reproduce:
1. Open the “PreviewSelector.zip“ project
2. Open the “SampleScene“
3. Select the “Test“ GameObject
4. Click on “TestPreview1“ above the preview window
5. Select the “TestPreview2“ from the list of available previews
6. Observe the Console

Expected results: No errors are thrown and the chosen preview is selected
Actual results: “NullReferenceException“ error is thrown and the “TestPreview1“ gets always selected by default

Reproducible in: 2023.2.16f1, 2023.2.20f1, 6000.0.0b12, 6000.0.0f1
Not reproducible in: 2021.3.37f1, 2022.3.26f1, 2023.2.15f1, 6000.0.0b11

Reproduced on: Windows 11 Pro (23H2), macOS 14.4.1 23E224 Darwin 23.4.0 (by the reporter)
Not reproduced on: No other environment tested

Note: Reproducible if the default preview “TestPreview1“ is selected from the available previews too