Updating linux kernel results in modules shrunk not in nix store

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Using this rev (without setting to latest) works with the above changes, but latest unstable does not.

    "nixpkgs": {
      "locked": {
        "lastModified": 1720750130,
        "narHash": "sha256-y2wc7CdK0vVSIbx7MdVoZzuMcUoLvZXm+pQf2RIr1OU=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "6794d064edc69918bb0fc0e0eda33ece324be17a",
        "type": "github"
      },
      "original": {
        "owner": "NixOS",
        "ref": "nixpkgs-unstable",
        "repo": "nixpkgs",
        "type": "github"
      }
    }

This gives me kernel 6.12.18