WOW briden, awesome find! I seriously figured you were mistaken or off in your description here.
I've never seen that before, I'm stumped. My GUESS is I noticed that the piece seems to be sitting on a ramp then merged up and through. The first one you hippie jumped check to see if there's a also a ramp under the pad.

Maybe when prop's are on a ramp they can be glitched through a pad above. I also noticed the pads are upside down. I'm going to try this later on no doubt.