How to reproduce:
1. Open the “2454037.zip“ project
2. Select the “anim1p_semiauto_colt_newservice.fbx“ in the Project Window
3. Select the “anim1p_semiauto_colt_newservice_loadedstate” clip in the Inspector (Animation Tab)
4. Scroll down the Inspector and under “Mask/Transform“ press the “Expand All“ button
5. Find and disable the last (“trigger“) checkbox, then press Apply
6. Repeat steps 2-4
7. Observe the last (“trigger“) checkbox and the “Apply“ button below

Expected result: The checkbox is disabled, and the “Apply“ button is disabled
Actual result: The checkbox is enabled, and the “Apply“ button is enabled

Reproducible in: 6000.2.0a9, 6000.2.3f1, 6000.3.0b1
Not reproducible in: 6000.2.0a8

Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested

Notes:
- Works on other Animation Clips and Mask Transforms as well (including “root“)
- Apply button works correctly, meaning it serializes the changes successfully. It looks like a visual problem