Renaming a GO property works fine on transform properties, but doesn't work and generates an error when done on a sprite.

repro:
-open project
-open Sprite_Locomotion scene
-open AW
-select Root GO
-click twice on the "Hips : Sprite" property to rename it... "Hips" text becomes selected and editable.
-type in a new name and hit enter... error...
"InvalidCastException: Cannot cast from source type to destination type."