“NullReferenceException” errors thrown when creating Style Rule Selection Asset in Project window

Steps to reproduce:
1. Create new Unity project
2. In Project window create Style Rule Selection Asset (right-click in Project window > Create > Style Rule Selection)
3. Observe Console window

Actual results: “NullReferenceException: Object reference not set to an instance of an object” errors are thrown in the Console window after creating Style Rule Asset
Expected results: No errors are thrown in the Console after creating Style Rule Asset

Reproducible with versions: 6000.5.0a8 (d36222f39966)
Not reproducible with versions: 6000.5.0a7 (0841031ff752)

Tested on (OS): macOS Silicon 26.3 (M1)