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Keep companion mod data when upgrading old worlds to 1.19.4 - #532
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SkyBlade1978
merged commit Nov 9, 2026
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MinecraftModDevelopmentMods:master-1.19.4
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Base Metals can convert a legacy chunk before companion mods have had a chance to preserve their own data. This gives them a hook before conversion so that old items and machines keep their state. Base Metals still upgrades worlds on its own. The combined tests cover original Advantage 1.10 and released base* 1.10 and 1.12 worlds, including machine operation and a full restart.