Why can't PlayerControllers stop movement in progress?

Okay, I just tried adding an explicit “cancel movement” action by calling Simple Move To from a right-click, and while doing this from left-click works, doing it from right-click does not work. That’s super strange! Color me as confused as you – clicking very close to the character stops it, but right-clicking, which takes the object location and calls simple move to, does not work. (Even if slightly perturbing the location.)