Is this widget full screen? The first click gets consumed by the UI, but double-click is unhandled and the 2nd click reaches the Player Controller only? Feasible?
Run the Widget Reflector, see what you hit.
After first click, when i press “Right Mouse Button” and “Left Mouse Button” it fires.
That would align with the abovementioned theory, too. The RMB is unhandled, focus is passed to the Player Controller.