After realizing i could walk through slabs in my Realm on PS4, I've done some testing and it appears that after the last update, if you spam the jump button with an elitra it introduces some collision problems, seems to me like the players collision box doesn't come back to normal and gets stuck at a 1 block height, allowing the player to walk though anything as long as the block in front of the feet is free, you can still die of suffocation though.

There's 2 videos attached, a shorter one showing how to replicate, and a longer one showing the effects after the glitch is done.