How to reproduce:
1. Open the attached “IN-130277_6_Test“ Project
2. Open the “ReproScene” Scene
3. Select the “UITK” GameObject
4. Observe the Inspector

Actual result: The “UITK” GameObject’s custom preview does not have a dropdown that allows for switching between different previews
Expected result: The “UITK” GameObject’s custom preview has a dropdown that allows for switching between different previews

Reproducible with: 2023.3.0a2, 6000.0.67f1, 6000.3.7f1, 6000.4.0b7, 6000.5.0a6
Could not test with: 2023.1.0a1, 2023.2.0a1 (CreatePreview method is not available in these versions)

Reproducible on: Windows 11, macOS (26.2) (by user)
Not reproducible on: No other environments tested

Note:
- This issue reproduces differently in Unity version 2023.3.0a2
- Selecting the “UITK” GameObject creates 2 “Hello UITK 2” texts, and any subsequent selection creates another 2