How to reproduce:
1. Open the “Portal Pilot” project
2. Open any scene
3. Select any GameObject in the Hierarchy window
4. In the Inspector, click the icon button next to the GameObject name, then select “Other…”.
5. Resize the Select Texture 2D window by dragging its bottom edge to make it smaller
6. Click the double line icon at the bottom of the window and drag it upwards
7. Observe the result

Expected result: Tab expands
Actual result: Tab doesn’t expand

Reproducible with: 6000.2.0a8, 6000.2.0b3
Not reproducible with: 2022.3.62f1, 6000.0.50f1, 6000.1.4f1 6000.2.0a7

Reproducible on: Windows 10, macOS 15.4.1
Not reproducible on: No other environment tested

Note:
- Making the window bigger resolves the issue