I have never had a world corrupt until this update. It's a large converted Xbox One Edition world that got corrupted after the world file surpassed 300mb after exploring and generating new chunks. I try and load up the world and it crashes the game and when I get back on it I get an error message saying the world is corrupted with a grey default thumbnail and the world file at 524mb.
I've never seen this before and is not an isolated occurrence. An Xbox Club im in just had 2 other players post screenshots of the same error message stating their world of 3 years is corrupted.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-35364.
Please add a vote and any new information to the main ticket, which will be updated accordingly.
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