There are blocks that I placed randomly generating nearby. It's duplicates of what I have placed previously, but I did not place. It seems to be just one chunk or so of the blocks.
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Please attach the affected world.
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The whole world folder, please.
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The world folder is 486 MB when compressed and I can only upload up to 10 MB. What should I do?
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Fair point. Do this test for me, please:
1. Place a yellow wool block on top of the duplicated blocks
2. Place a red wool block on top of the place where the blocks were duplicated from
3. Reload the world. What happened to the wool blocks, exactly?
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I placed the yellow on the duplicated and the red in the same spot on the originals, and when I reloaded they had disappeared.
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Both wool blocks disappeared?
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Yep.
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That's... not good. I assume you have no clue how this happened so it's going to be very difficult for the developers to fix this issue. You can probably fix it yourself by deleting both affected chunks using MCEdit (keep backups!).
Probably related to or duplicate of MC-74762.
One last question: Do you use OptiFine?
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Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.