Tripwire not triggered by player in minecart or pig riding, but does for horses and boats

Tripwires are not being tripped by the body of a passenger seated in a Minecart. The Minecart and its passenger pass through the Tripwire as if the Minecart is empty and passing under the Tripwire. As a pedestrian (not in a Minecart), the player's body does trip a Tripwire upon passing through it.... It's the player as passenger in a Minecart that is the problem.

Also, upon close proximity to a Button, the user is engulfed by the image of the button as if the user is inside the Button.