Forcing these inputs to follow the root nixpkgs changed the ComfyUI package's derivation hash, which invalidated the binary cache and queued a 91-derivation rebuild (the full ComfyUI Python closure plus cudnn, nccl and libnvshmem). Restore each input's own locked nixpkgs and the original flake.lock, which matches the already-built, cached closure. A dry-build now reports nothing to build. The single-nixpkgs cleanup is not worth forcing multi-hour CUDA rebuilds.
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