Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. In Hierarchy create Label object (Right-click > UI Toolkit > Standard Elements > Label)
3. Open Animation window (Window > Animation > Animation)
4. Select “Label” in Hierarchy window and press “Create” in Animation window to create Animation clip
5. In Animation window add “Bottom” Property
6. Expand “Bottom” property
7. Observe the “Bottom.unit” dropdown button
Actual results: Dropdown button shows no value
Expected results: Dropdown button shows “px” or “%” value, consistent with other Properties dropdown buttons
Reproducible with versions: 6000.6.0b1, 6000.6.0b7, 6000.7.0a4
Can’t test with versions: 6000.0.81f1, 6000.3.21f1, 6000.5.7f1, 6000.6.0a7 (UI Toolkit Animation not available)
Tested on (OS): Ubuntu 24.04, macOS Tahoe 26.5.2 (M1)
Notes:
- Enable UI Toolkit Animations in Project Settings window, Editor restart required to create Animation Clip for UI element
- Issue is visible with Top, Right Properties as well