Freezes when generating world

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What I expected to happen was...:
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What actually happened was...:
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Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... when I go on creative and then I sign out I can't get back on back on I have to go on survival and then sign out and then it will work problem 2 if I put down several worlds corrupt every single one but the recent one if I get a snowy World it will immediately corrupt
3. ...