Just playing in a world created before 18w14b, when it unexpectedly crashes. Seems to have to do with a zombie - I can get back in the world but I'm not fast enough to paste the /kill command to get rid of it, and time until crash gets shorter each time i join the world.
EDIT: The difficulty is on Peaceful - there are no zombies.
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However, this issue is a Duplicate of MC-124123.
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