Animator controller freezes when you disable Animator component, move a state in the Animator, then re-enable the Animator controller.

repro:
-open project
-open Locomotion scene
-click Editor Play
(while in runtime)
-select Greg in Hierarchy
-disable the Animator component
-move a State in the Animator
-re-select Greg
-re-enable the Animator component...
bug: states and layer weights are frozen (see attached Animator.gif).
expected: states and layer weights are re-enabled properly.
note: Editor Stop, then Play again, fixes the controller.