Reproduction steps:
1. Open the attached “BugRepro” project
2. Open the “Assets/New Animator Controller.controller” animator controller
3. Click on the “New State” state
4. In the Inspector window observe the “Test Val” value is 5
5. Copy the “New State” state (ctrl+c)
6. Paste it (ctrl+v)
7. Click on the “New State 0” state
8. In the Inspector window change the “Test Val” value to 3
9. Click on the original “New State” state
10. In the Inspector window observe the “Test Val” value

Expected result: “Test Val” value remains 5
Actual result: “Test Val” value has changed to 3

Reproducible with: 2021.3.40f1, 2022.3.36f1, 6000.0.10f1

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