What happened?
If you rename a child object that has animation properties present in it's parent's animation, the animation will no longer have a reference to the correct child object and the animation will no longer work. 

Current workaround is just to rename the child object back to it's original name. This will fix the animation.

Steps to Reproduce

1. Create a new Unity project on one of the affected versions
2. Create a new Game Object, and a child Object within that
3. Add an animation to the Parent object that contains a Property from the child object below it.
4. Rename the child object
5. Observe within the animation, the property is now labelled as 'Missing!' and the animation does not play correctly

Expected Result
When an object is renamed, it will correctly update it's name within the Animator so that the animation is not broken.

Actual Result
The animator's reference to the object is broken once renamed, so the object would have to be animated again.