It happened to me many times, also in earlier versions (I lost many worlds).
every time after death when I choose to exit the game (to the main menu) instead of respawn I lost the world for ever and I can't enter the world anymore and stuck in generating world (Building terrain).
so it is like that:
Playing (survival mode not sure about the other modes)> Death > ---two options "Respawn or go to main menu" >choose main menu> try to enter the world again> endless building terrain.
It is a bug, I have encountered this many times, I don't use any extra resource Packs or anything.. I am starting to hate the game because of that. please fix it!
Please I want to be able to enter my world again.
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Thank you for your report!
We're tracking this issue in MCPE-159285, so this ticket is being resolved and linked as a duplicate.
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