An invisible floor switch has a higher priority than an invisible actor. If you teleport the hero to a place with only an invisible actor and the hero looks in its direction, the screenplay of the invisible actor will be activated. I tested this with a “hero says-command” as a delay, in order not to activate the invisible actor accidentally myself after the teleport.
If at the teleportation target also exists an invisible floor switch only the screenplay of that switch will be executed. The screenplay of the invisible actor will be skipped completely. Is that behavior intended?