As of 16w07a, one must jump in midair in order to activate the elytra. However, as a side effect of this, the elytra now stops working on world relog.
To reproduce:
1. create a new world
2. give yourself an elytra
3. put yourself in the Elytra flight mode
4. log out
5. log back in
you should no longer be flying.
Related issues
relates to
Comments


What's with the environment change? Does this happen in multiplayer also?

@unknown single player is actually just a 1 player local server, so that shouldn't really matter anyway
Anyway, the enviroment is supposed to contain pc details.
Confirmed