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Animator.WriteDefaultValues does not restore default values when it is called



Reproduction steps:
1. Download and open the attached project: ""
2. Open the "AnimatorTestScene" in the Assets folder
3. Open the "Animator Controller.controller"
4. Enter Play Mode and select the "AnimatorTestObject" in the Hierarchy
5. In the Animator window press on Parameters and observe the values
6. Press on the Game view to focus on it
7. Press the space bar and observe the Animation Parameters again

Expected result: The values change to the ones before entering the Play Mode
Actual result: The values do not change

Reproducible with: 2019.4.29f1, 2020.3.16f1, 2021.17f1, 2021.2.0a1, 2021.2.0b7, 2022.1.0a5
Not reproducible with: 2021.1.0a10

  1. Resolution Note (2022.1.X):

    This is by design.

    WriteDefaultValues' purpose is to reset animated properties to their default values. Thus, if the controller parameters are driven by an animation curve, they will be restored to their default values when calling WriteDefaultValues. In the use case highlighted by this bug, the controller parameters are not animated.

    The parameters were reset prior to Unity 2021.1.11f1 because of another bug fix that introduced this regression. It has been fixed since then and the behaviour is now what it's always been.

    I recommend writing back the controller parameters yourself if you wish them to be reset instead of relying on WriteDefaultValues.

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