I tried to boot up my world for 1.20, last time I played I was in a mine. When I loaded the world, I was in my library, which has now been reverted to an earlier state. Nearby I was building near a lava pond, all that remains of it is a single twisting vine floating above the chunk.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Is that an older, bigger world?
Has this reproduced for you ever again since writing the report?