When clicking onto a control-point of a planarFigure AND have a rather time-consuming operation connected to the EndInteractionPlanarFigureEvent() AND move your cursor out of the RenderWindow while this operation is done, the planarFigure is not in correct state after the operation is finished.
This is because the statemachine checks the hovering after deselcting the control-point. However, the event that is used here still has the same coordinates -> is still above the control-point.
Instead, the control-points should be deselected, when a new mousemove event comes, everything is fine again.