[GAMEPLAY] one sided Rek'Sai tunnel

So I was derping in a custom game against a friend 1v1 when I made that tunnel I"m next to in the picture.

If you look into it, that tunnel leads nowhere. It is an entrance with no exit. Funtionally: -I can "enter" it, do the enter tunnel animation, but it goes nowhere and does nothing -it does not age, lasting over 20 minutes without it's durability bar going down (as opposed to the standard 10 minutes) -It cannot be broken, my friend tested it by trying to break it, with no luck, didn't even display the breaking animation -It CAN be Rek'Sai ulted to and teleported to.

Essentially this tunnel is a permanent ult/tp target that cannot be managed in any way. That is all it does.

Creation: I have no idea. No bloody clue.

My friend was elise while we were fighting, but I have no clue what caused it to happen. I didn't notice it right away.