Reproduction steps:
1. Open the attached “IN-96466.zip” project
2. Open the “NewScene” Scene
3. From the Hierarchy, select the “Spline” GameObject
4. In the Scene view, change Active Context to Spline (Click on the Spline icon)
5. Select one or more Knots
6. In the Scene view, in Element Inspector change the tangent mode from “Linear” and “Auto”
7. Enter the Play mode
8. Exit the Play mode
9. Observe the previously changed tangent modes

Expected result: The selected tangent mode remains (“Auto”)
Actual result: The changes get reverted to the previous tangent mode (to “Linear”)

Reproducible with: 2.1.0, 2.7.2 (2022.3.59f1, 6000.0.41f1, 6000.1.0b9, 6000.2.0a6)

Reproducible on: Windows 10 (User reported), Windows 11
Not reproducible on: no other environment tested

Notes:
- Issue appears to specifically reproduce when switching from “Linear” to “Auto” or from “Bezier” to “Auto”, but not the other way
- Reproduction of the issue can be inconsistent, therefore there might be a need to repeat 5-9th steps a few times
- Could only reproduce when editing values for a Prefab instance
- Does not reproduce when editing Tangent modes in the Inspector
- No difference was observed if the Scene is saved or not after making the changes