Path is not in the nix store during nixos-rebuild switch

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same issue as this Issue building linux kernel modules after Flake update

tldr there was a regression that broke building with nix 2.18.5, you can use a nix-shell like the following to build the configuration with a newer version of nix then swap to the resulting config:

{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz") { } }:
pkgs.mkShell {
  packages = with pkgs; [
    nixVersions.latest
  ];
}
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