I go to explore my surroundings a little away from my home that I built and as I get out a few hundred blocks away the entire edge of the world is gone. I make my way back to my built structure and it too is half gone. I even fell from the edge and it kept making me fall. I had to shut down my program and restart it, luckily the auto save saved me from having to try to figure out how to turn it to creative even though cheats are not enabled.