[StateMachineBehaviours] All prefabs share same state machine.

I'm experimenting with AI state machines using mecanim. It was going well until I realized all the AIs are sharing the same instance of their state machine.

I am not doing anything strange. I basically have a bunch of prefabs, that have Animator components, these have my desired AnimatorController.

I tried Instantiating the controller on Awake, just to be sure: _animator.runtimeAnimatorController = Instantiate(_animator.runtimeAnimatorController);

That didn't fix the issue. I also tried setting the Animator from another sane script into the SMB (my SMB scripts have a data section that is set on Start). Using that instead of the passed-in animator didn't help either.

Any ideas what the problem is? I find it hard to believe this is expected behaviour... Thank you!