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1.21.6's copy only differed from 1.21.7's in RenderScopeImpl: item rendering uses ItemRenderState, which 1.21.7 renamed to KeyedItemRenderState. That's behind a version comment; 1.21.6 keeps its older loader_version (0.18.5) in its gradle.properties. Moving a version over leaves the old mc-<v> project's compiled classes in the shared build/ folder, so a removed class (1.21.6's dead NameTagMixin) still got packaged until a clean. VERSION_GUIDE now says to run :<v>:clean once after moving a version. Co-Authored-By: Claude Opus 5.5 <[email protected]>