I created a new world on my iPhone 6, running iOS 9 in Survival mode. My sister joined the game through my iPod Touch (4th Gen, running iOS 6) over local wi-fi connection. We played on this file continuously for 4 hours, created a house, underground mines,etc. Then all of a sudden, Minecraft crashed on the iPhone 6, so obviously the iPod ended up disconnecting. Now, when I loaded the world again, the house and the mines were gone and the world became exactly the same as it was originally, as in it was the original map of the seed with no changes. The only things I retained were the items I was carrying in the inventory. Please fix this bug, as I don't want to play Minecraft PE knowing that I might lose all of the work I've done at any instant of time, if the game were to crash. I won't play this game until I know this bug is fixed.