[2D] Polygon Collider 2D on Sprite Shape reverts to initial shape after editing

Steps to Repro:

- create a new SpriteShape in the hierarchy
- add a Polygon Collider 2D to the SpriteShape
- click on Edit Collider for the Polygon Collider 2D and change the shape
- click Edit Collider again to stop editing
- click off the SpriteShape then select it again

The Polygon Collider 2D reverts back to its initial shape instead of retaining the edited shape.