Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. In Hierarchy create Button object (Right-click > UI Toolkit > Standard Elements > Button)
3. Open Animation window (Window > Animation > Animation)
4. Select “Button” in Hierarchy window and press “Create” in Animation window to create Animation clip
5. Add the "Unity Font Style And Weight" property via the "Add Property" button
6. Enter “11111111111” value
7. Observe the Property
Actual results: the Property disappears from the Animation window after the value is entered
Expected results: the property remains visible, entered value is either accepted and displayed in scientific notation (1.1111e+10), or rejected with a validation message, the property doesn’t disappear
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): macOS Tahoe 26.5.2 (M1), Ubuntu 24.04
Notes:
- Performing the same steps with the Opacity property doesn’t reproduce the issue, the property remains visible and the value is converted to scientific notation (e.g., 1.1111e+10)