How to reproduce:
1. Create and open a new project
2. Create a new Material in the Project tab, then select it
3. Try selecting, for example, the "Smoothness" value
4. Observe the Inspector

Expected result: The field is selectable and editable by writing
Actual result: The field is unselectable and non-editable by writing

Reproducible in: 6000.2.0a7
Not reproducible in: 2022.3.61f1, 6000.0.47f1, 6000.1.0b15, 6000.2.0a6
Fixed in: 6000.2.0a8

Reproduced on: Windows 11 Pro (24H2), macOS 15.3
Not reproduced on: No other environment tested