So if you put an elytra on and start gliding then go in water i think, you can go through a block that is 1 block above the ground.

    And  = 1 Minecraft block. =cant walk through = can walk through.

This glitch has caused me to die multiple times and loose all my stuff multiple times in an unfair way, and the end is also starting to get very glitchy , such as on realms if you go through an end city portal back to the ender dragon fight arena, it causes everyone on the realm to be kicked and then rollbacks time which has caused me and a lot  of people to have their things voided.