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Keep old expansion machine data when upgrading worlds on 1.21.1 - #540
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SkyBlade1978 merged 1 commit intoNov 11, 2026
Merged
SkyBlade1978 merged 1 commit into
SkyBlade1978 merged 1 commit into
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SkyBlade1978
merged commit Nov 11, 2026
327c197
into
MinecraftModDevelopmentMods:master-1.21.1
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This keeps old machine directions, inventories and item wear intact when a
world is upgraded with the Base Metals expansions installed.
Base Metals now offers a small migration extension hook so basePower can
preserve its data before Minecraft converts the old chunks and item stacks.
The hook works regardless of which transformer is applied first. Existing
Base Metals registry names and gameplay are unchanged.
The patch is version 3.1.2.121011. The README and changelog are updated.
Local checks cover the migration hook, original-world conversion and cold
restart, along with the coordinated basePower, baseSteam and baseElectric
machine and endurance tests. The accepted player jar is pinned by SHA-256:
7C0B961A8D4991C9B69379518AAD700A71C1E4B2076CF5DEF292C58029408A07Publication will wait for the merged build to reproduce that jar.