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I have saved some structures to structure blocks in version 1.12.1.

Will the structures load correctly if I transfer those blocks to a newer version 1.20.1?

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In Minecraft 1.13, the structure and IDs of many blocks were changed, in what is known as The Flattening.

Unfortunately, structure blocks from before this version do not get converted. Per the History section on the Minecraft wiki article for Structure Blocks, when loading pre-1.13 structure blocks in a post-1.13 world, it will not load in any blocks whose internal ID has changed.

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    The history of the world save file is pretty interesting: minecraft.wiki/w/Region_file_format McRegion was editable with McEdit which has long faded away
    – qwr
    Commented Jan 22 at 6:06

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