Reproduction steps:
1. Open the attached “IN-98449.zip” project
2. Open the “SampleScene”
3. Select the “Main Camera” GameObject from the Hierarchy
4. In the Inspector find the “Cinemachine Brain” Component
5. Click on the Settings icon next to the “Custom Blends” property
6. Observe dropdown does not open
7. Expand the “Custom Blends” property
8. Click on the dropdowns under “From” and “To”

Expected result: The dropdowns open
Actual result: The dropdowns do not open

Reproducible with: 3.0.0-pre.5 (2022.3.60f1, 6000.0.45f1, 6000.1.0b13, 6000.2.0a8), 3.1.3 (2022.3.60f1, 6000.0.45f1, 6000.1.0b13, 6000.2.0a8)
Not reproducible with: 3.0.0-pre.4 (2022.3.60f1, 6000.0.45f1, 6000.1.0b13, 6000.2.0a8)

Reproducible on: macOS 15.3 (M2 Ultra), macOS 14.2.1 (M1 Pro)
Not reproducible on: Windows 11

Note:
- The dropdown randomly sometimes opens, but usually only once and after domain reload or reopening the project