Axis::stop has no effect after move(..., wait=False)

Tried with a mockup axis:

controller:
  plugin: emotion
  class: mockup
  axes:
     - velocity: 1
       name: simot1
       acceleration: 10
       steps_per_unit: 100

WWW [1]: simot1.state
Out [1]: AxisState: READY (Axis is READY)

WWW [2]: move(simot1, 1000000, wait=False)
WWW [3]: simot1.state
Out [3]: AxisState: MOVING (Axis is MOVING)

WWW [4]: simot1.stop(wait=False)  # doesnt stop
WWW [5]: simot1.state
Out [5]: AxisState: MOVING (Axis is MOVING)

WWW [6]: simot1.stop()    # stuck, can't ctrl-c