I have a world with my sister, and we got elytra. We planned to go to the ancient city with it, but when we fly, chunks stop loading, and we are in air. After some time mins we spawn in ocean, or on ground often dead. This bug ruins any point of this item, and now it is useless. Hope Mojang will fix this or i will stop playing the game, because elytra is very much inportant in survival world. 

I tested it on new generated world to showcase.