Reproduction steps:
1. Open the attached “IN-89422 Animation.zip” project
2. Open the “Tutorial Scene” Scene
3. Select “New Animation.anim” from the Project Window
4. Switch to “Debug” view in the Inspector (Three dots in Inspector > Debug)
5. Enable the “Legacy” property in the Animation Clip settings
6. Enter the Play mode
7. At the top change the “TimeScale” value to 0
8. Observe the Game view

Expected result: The hand is animated
Actual result: The hand animation has stopped

Reproducible with: 2021.3.46f1, 2022.3.53f1, 6000.0.30f1, 6000.1.0a7

Reproducible on: Windows 11
Not reproducible on: no other environment tested

Note:
- Unchecking the “Legacy” property then breaks the animation and only works after the Editor is restarted