so when i was playing on a muliplayer server i used the elytra and when i didnt know how to use it i fell and before i died the game crashed
i had to get assistance from the owner to reverse the effects of this bug. but that is not where this story ends
today i tried to use the elytra and crashed the game rendering the save files useless and broken, for reference here is the crash log

Completely ignored arguments: [--nativeLauncherVersion, 307]
[20:50:39] [Client thread/INFO]: Setting user: ichacody
[20:50:40] [Client thread/INFO]: LWJGL Version: 2.9.4
[20:50:41] [Client thread/INFO]: Reloading ResourceManager: Default, NostalgiaCraft Beta 3.zip
[20:50:41] [Sound Library Loader/INFO]: Starting up SoundSystem...
[20:50:41] [Thread-5/INFO]: Initializing LWJGL OpenAL
[20:50:41] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[20:50:42] [Thread-5/INFO]: OpenAL initialized.
[20:50:42] [Sound Library Loader/INFO]: Sound engine started
[20:50:43] [Client thread/INFO]: Created: 1024x512 textures-atlas
[20:51:07] [Server thread/INFO]: Starting integrated minecraft server version 1.10.2
[20:51:07] [Server thread/INFO]: Generating keypair
[20:51:08] [Server thread/INFO]: Preparing start region for level 0
[20:51:09] [Server thread/INFO]: Changing view distance to 12, from 10
[20:51:15] [Server thread/INFO]: ichacody[local:E:bc580d1b] logged in with entity id 19 at (-443.5, 4.0, 1059.5)
[20:51:15] [Server thread/INFO]: ichacody joined the game
[20:51:16] [Server thread/INFO]: Saving and pausing game...
[20:51:16] [Server thread/INFO]: Saving chunks for level 'New World'/Overworld
[20:51:16] [Server thread/INFO]: Saving chunks for level 'New World'/Nether
[20:51:16] [Server thread/INFO]: Saving chunks for level 'New World'/The End
[20:51:18] [Server thread/INFO]: ichacody has just earned the achievement [Taking Inventory]
[20:51:18] [Client thread/INFO]: [CHAT] ichacody has just earned the achievement [Taking Inventory]
[20:51:28] [Thread-5/ERROR]: Error in class 'CodecJOrbis'
[20:51:28] [Thread-5/ERROR]: Ogg header not recognized in method 'readHeader'.
[20:51:28] [Thread-5/ERROR]: Error in class 'CodecJOrbis'
[20:51:28] [Thread-5/ERROR]: Error reading the header
thank you for your time