Worlds generated in old versions are corrupted when entering nether.
After entering the nether and leaving the world is partially corrupted, only the part generated in the previous version became corrupted.
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Cleaning up old tickets: This ticket has not been updated recently (1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Worlds from older versions (0.16 and before) that were updated to the 1.0 beta (0.17.0.1/0.17.0.2) cannot be fixed.