When I ride on a pig I can go through one block high spaces

I don't know what version I am playing on, but it is on the IPad. When I ride on a pig, I am able to go through one block high spaces and sometimes it glitches and I am able to see cave systems and some blocks are invisible. Also, Mumbo Jumbo also discovered this. https://youtu.be/W9CTI497RYg 7:37