“ArgumentNullException” and Enum/Keyword errors are throw in the Console when setting Element Cursor property to None in Transitions Animations

Steps to reproduce:
1. Create new Unity project
2. Open UI Builder window (Window > UI Toolkit > UI Builder)
3. In Library find “Label” element and drag it to Hierarchy
4. In Inspector window scroll down and find “Transition Animations”
5. In “All 0s Ease 0s” > Property select Cursor > none
6. Observe the Console window 

Actual results: Errors “ArgumentNullException” and “Trying to read value of type Enum while reading a value of type Keyword” are thrown in the Console window
Expected results: No errors should be thrown in the Console window

Reproducible with versions: 6000.2.0a8 (6bc6fbc26ac6), 6000.2.6f1, 6000.3.0b3
Not reproducible with versions: 6000.0.58f1, 6000.1.16f1, 6000.2.0a7 (54cbf955d0e8)

Tested on (OS): macOS Silicon, Sequoia 15.6 (M1)