Reproduction steps:
1. Create any new project
2. Create a new Material (Assets > Create > Material)
3. Select the Material from the Project Window
4. In the Inspector find the Material Inspector Window
5. Click on the three dots
6. Select ‘Convert to Floating Window’
7. Observe the Console

Expected result: No errors
Actual result: “NullReferenceException: Object reference not set to an instance of an object” error

Reproducible with: 6000.0.7f1, 6000.0.26f1,
Not reproducible with: 2021.3.46f1, 2022.3.51f1, 6000.0.6f1, 6000.1.0a3
Fixed in: 6000.1.0a1

Reproducible on: Windows 11
Not reproducible on: no other environment tested

Note:
- Affects HDRP, URP and Built-In