Environment:
Apple TV 64GB, dozens of GB's free, Minecraft Version 1.0.8. Worlds stored locally on my Apple TV. I am not using realms, subscription services, multiplayer gaming, etc. Just the basic setup, as configured straight after the original purchase of Minecraft. Apple TV is accessing my home network and the internet via WiFi.

Same problems here,as detailed in older project MCPE-19383, still unresolved. The game of Minecraft on Apple TV, although playable, is in effect aimless. As soon as you build a world that you are happy with, you are 100% guaranteed to lose it. On survival mode, which really is the primary (non cheat) mode, the only way to obtain the materials necessary to reach a certain level of comfort/security is to have a world big enough in megabytes to be corrupted.

The descriptions of my fellow sufferers in MCPE-19383 are identical to what I would have provided.

In addition, if it helps locate the problem/solution better:

• Although there are (rare) game crashes while playing, on return to the game, I may lose just a little bit of my progress, which is not a big problem. These may be related to WiFi interference, or issues that I cannot identify, but this is not my main issue here. I just note it because I noticed your comments accompanying the latest release and I suspect that you may have been looking in the wrong direction...

• MY WORLDS NEVER GET CORRUPTED AND RENDERED UNUSABLE DURING PLAY, OR IF I "QUIT AND SAVE" AND IMMEDIATELY RESTART PLAY.

• MY WORLDS HAVE IN ALL INSTANCES BECOME CORRUPTED AFTER CONFIRMED SAVES AND EXITS FROM MINECRAFT, BUT ON CONDITION THAT
  (A) I RETURNED TO PLAY THE GAME HOURS LATER, USUALLY OVERNIGHT AND
  (B) THESE WORLDS WERE "BIG/COMPLEX ENOUGH"
  UNDER THESE CIRCUMSTANCES MINECRAFT IMMEDIATELY REPORTS THE CORRUPTION UPON LOADING, BEFORE YOU EVER GET THE CHANCE TO USE THE WORLD THAT YOU HAVE PAINSTAKINGLY PREPARED.

i do not know how complex this bug is to track down. Your investigation is already months old apparently. In the meantime however, it is important to realize that Apple TV, as a product, offers no file management or global backup method, or any way of taking a backup copy of the Minecraft datafile that relates to a particular world. I have just confirmed this with Apple. SURELY MOJANG CAN AT THE VERY LEAST OFFER IN THE NEXT VERSION FOR APPLE TV THE ABILITY TO BACKUP A WORLD LOCALLY OR EXPORT A FILE SOMEWHERE !!!

Many thanks