Elytra stops working when teleported into unloaded chunks

Can you provide steps to reproduce the issue? Was the Elytra possibly just a ghost item (only displayed in the client)? I was able to reproduce this exact issue with a ghost Elytra equipped.

I'm not sure yet how to reproduce it. What exactly do you mean by ghost item? The item just worked fine and after I teleported myself it just stopped working. As you can see in the video I took the Elytra out of the slot and placed it again there. It still had that problem. I'm gonna look how to reproduce it now

Can confirm for 15w42a. After some research I found that elytra stop working consistently when the player enters an end gateway. It doesn't matter how the player entered the gateway (i.e. throwing an ender pearl and simply stepping in by breaking the bedrock beforehand have the same outcome). Killing oneself or entering the end portal back to the overworld fixes the issue again. Nether or end portals don't seem to be affected by this bug.

I was able to reproduce this glitch with the tp command in the overworld. View distance seemed to have something to do with it, since places I could tp to and still have them function with view distance at 9 wouldn't work at 2, and places that wouldn't work at 9 worked at 32.

EDIT: After further testing, teleporting to unloaded chunks while not having Elytra equipped and then equipping them after the tp still causes them not to function.

Confirmed for 15w43c.

I found out how to reproduce it:
1. Make sure you're not gliding with an elytra (stand on the ground or fly in creative mode).
2. Teleport to a high place with unloaded chunks where there is enough space to the ground to glide.
3. Try to glide with the elytra and observe the issue.

For example, you are on the coordinates of X:0 Y:10 Z:0. You're wearing an elytra. Then enter the command "/tp <your player name> 1000 100 1000" (if chunks in that area isn't loaded and if the Y coordinates is high enough to glide). You'll fall like a spike when you try to glide, like you normally would do without an elytra.

Confirmed for 15w44a.

The reproducing method of Swekob worked for me today. I made a little video showing it working first then breaking while doing a teleporation and I am also showing that it is not a ghost item by trying to fly with a different Elytra. https://www.youtube.com/watch?v=0xPxuxWQl6A&feature=youtu.be
Edit: I realized that the method by Swekob doesn't always work. Setting the render distance very very low (in my case 2) results in 100% broken Elytra

Confirmed for 15w46a

@unknown no need to comment, you can update the affected versions yourself

Confirmed for 16w03a.
Only moderators can update the affected versions.

@unknown: no, only mods and the reporter, @unknown is the reporter, check your stuff, before saying somebody is wrong

Here is another example of the bug https://youtu.be/-MwDz1vCAH8

The issue is that sometimes after teleporting elytra don't activate when hitting space. In my case, using tp commands through chat only seems to cause it sometimes (possibly only if transporting to an unloaded chunk), whereas command blocks seem to cause it more regularly. Even after un-equipping and re-equipping new elytra the problem persists.. The only way to get them to work again is by dying or restarting the game.When playing in a world updated from 1.8, command blocks already there before the update don't seem to cause the issue, but any command block placed in 1.9 seems to cause the issue.

resolving to MC-92916, this is not the only issue that arrives when teleporting to unloaded chunks