I was currently on this world while my power went out it lasted about an hour before it was restored. I went back on Minecraft to play again and it said there was a data compromise and I had to delete the saved data which I thought would just be the few hours leading up to the power outage not my ENTIRE world. I went on reddit and found a tip to go to my saved data in system storage. That did not work and my world is still gone:(
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This issue is being tracked at MCPE-62153.