Steps to reproduce:
1. Create a new project
2. Create a Parent gameObject and Child GameObject
3. Add an animator component on the parent object
4. Add properties for the child object and parent object
5. Attempt to change the names of properties (with F2)

Expected result: both parent and child properties can be renamed
Actual result: only child properties can be renamed

Reproduced on 5.5.4p2, 5.6.3p2, 2017.1.1p3, 2017.2.0f1, 2017.3.0b1

Notes:
-If name is deleted entirely, it becomes uneditable
-While the gameobject always needs to match the name of the property, copying an animation may break the link. Therefore a name change may be needed for the properties