Far Lands are invisible and you get an error if you try to walk into the farlands and you're disconnected! This was tested on more than one world and I restarted Minecraft more than once to see if it still happened.
To Recreate The Bug Watch My Video Of It Being Done:
https://www.youtube.com/watch?v=eV9Q41kjLX4&feature=youtu.be
Never mind: Dinnerbone has informed me this has been done on purpose!