Question animator.setfloat damptime loops in Blend Tree

I have following code running in Update on an object that is controlled by NavMesh:

Code (CSharp):

1. float movementSpeed = 0f;
2.         movementSpeed = navMeshAgent.isStopped ? 0f : navMeshAgent.velocity.magnitude;
3.         animator.SetFloat("TestNavMeshSpeed", navMeshAgent.velocity.magnitude);
4.  
5.         animator.SetFloat("MovementSpeed", movementSpeed, 0.5f, Time.deltaTime);
6.        Debug.Log("TestNavMeshSpeed: " + movementSpeed.ToString()); // Output confirms that movementSpeed does in fact stay 0

TestNavMeshSpeed is only used for debugging.
Initially, everything works fine, see first 3 screenshots in attached image.


As TestNavMeshSpeed jumps from 6.0 (not pictured) to 1.9 to 0, MovementSpeed is reduced smoothly to 0. In the Animator parameters list, MovementSpeed stays correctly at 0 after TestNavMeshSpeed has been 0 for a while.
The weird thing is that after reaching 0, MovementSpeed jumps up to ~10 (see bottom screenshot, 9.84748) in the Blend Tree only, damps down 0, and continues looping.

I was under the assumption that the MovementSpeed parameter in the animator and in the Blend Tree would always be in sync. Am I doing something wrong, or is this a bug?

Note: the damping takes a bit longer than 0.5 sec. First it ramps down quickly, as expected, but after reaching approximately MovementSpeed 0.5, it takes several seconds for it to reach 0.00001 (or something very low), before it loops over. Not sure if this is connected.

 

I have the same problem. Did you find a solution?