Animation window does not refresh on adding a new property.

Steps to repro:
1. Open the attached project.
2. Select the "Test1" state in animator controller.3. Create a new Animation clip in the Animation window.
4. Add Any property in the Animation window.

Actual Result:
Animation window does not refresh with the added property.

Expected Result:
Animation window should refresh on adding a new property.

Reproducible in:
2019.3.0a6, 2019.2.0b6, 2019.2.0a8.

Working Fine in:
2019.2.0a7.

Environment:
Only on Windows.

NOTE: NullReferenceException is thrown on adding a property with Regression Version 2019.2.0a8 while following the repro step.