While flying with the elytra now you take damage when you hit a wall (which is ok) but you immediately fall and hit the ground (or the void in the end) the elytra deactivates when you hit a wall 

How to reproduce: fly in the air and hit a block that is above the ground you will immediately begin to fall

Why this is an issue: in java edition this doesn't happen and you may die and lose all your stuff including the elytra