How to reproduce:
1. Open the attached “IN-129735” project
2. Navigate to Assets > Animations and duplicate the "RunChase_GolfClub before" animation (cntrl + d)
3. Click on the duplicate and change its wrap mode in the Inspector to "Clamp" or "Ping Pong"
4. Make sure the animation file is saved
5. Click on the duplicate again and change the wrap mode back to "Loop" and make sure the file is saved
6. Close and reopen the project
7. Open both files externally in Notepad
8. In both Notepad files, search for “90a”
9. Observe the result

Actual behavior: There are single character differences between the files
Expected behavior: Both files are exactly the same

Reproducible with: 2023.1.0a1, 6000.0.65f1, 6000.3.3f1, 6000.4.0b3, 6000.5.0a4

Reproduced on: Windows 11
Not reproduced on: No other environment tested