[Animation] Reset functionality is not working for Animation

Steps to Repro:
1. Create a new project
2. Hierarchy > right-click > 3D > Cube
3. Window > Animation > Animation
4. Select Project > Assets > New Animation > Inspector
5. Change Values Loop Time > true, Loop pose > true and Cycle Offset > 4
6. Click on cogwheel > Reset

Actual Result: Values are not set to default

Expected Result: Values are set to default

Environment : Mac and Windows

Reproducible on:
2019.3.0a3, 2019.3.0a2, 2019.2.0b3, 2018.3.9f1