How to reproduce:
1. Open the attached “IN-96102_animation_curve“ project
2. In the Project window select Assets > curve
3. In the Inspector window select “Curve“ field in the “New Mono Behaviour Script“ component
4. Change the shape of the curve and exit the Curve editor using the exit button (repeat at least 5 times)
5. Observe the results

Expected result: The changed shape of the curve is saved next time the Curve editor is clicked
Actual result: The changed shape of the curve is not saved next time the Curve editor is clicked

Reproducible with: 2023.2.0b14, 6000.0.41f1, 6000.1.0b9, 6000.2.0a6
Not reproducible with: 2022.3.58f1, 2023.2.0b13

Reproducible on: MacOS 15.3 (M4), Windows 11 (by user)
Not reproducible on: No other environments tested

Note:
- This issue only occurs when editing the curve directly in the Prefab Asset. The issue does not reproduce when editing a Prefab instance in a scene

Workaround:
- After changing the curve, click outside the Curve editor to exit instead of using the exit button, then the issue won’t happen