Since about a year ago after 1.19.31 was released, many worlds appear with the message "this world is not fully synced or has been corrupted" and I have been unable to access the worlds, nor edit/delete them. However, I am able to play in almost every one of these worlds on Minecraft Preview so the file can't be corrupted.
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We're tracking this issue in MCPE-162920, so this ticket is being resolved and linked as a duplicate.
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