[BUG] failed to load zls activated in nix-shell

[pseudocc]

Field	Description
Plugin	lsp
Nixpkgs	24.11
Home Manager	24.11
Project Flake	master

• I have read the FAQ and my bug is not listed there.

Description

I use zig and zls (0.13.0) on my system, but for some reason I have projects developed in zig (0.14.0) which is managed in flake.nix, but zls (0.13.0) is always loaded instead of zls (0.14.0).

Minimal, Reproducible Example (MRE)

programs.nixvim = {
  enable = true;
  plugins.lsp = {
    enable = true;
    servers.zls.enable = true;
  };
}

project flake.nix

{
  description = "MRE";

  # zig 0.14.0
  inputs.nixpkgs.url = "github:nixos/nixpkgs";

  outputs = { self, nixpkgs, ... } @ inputs: let
    inherit (nixpkgs) lib;
    eachSystem = fn:
      lib.foldl' (
        acc: system:
          lib.recursiveUpdate
          acc
          (lib.mapAttrs (_: value: {${system} = value;}) (fn system))
      ) {}
      lib.platforms.unix;
  in
    eachSystem (
      system: let
        pkgs = import nixpkgs {inherit system;};
        zig = pkgs.zig_0_14;
      in {
        devShells.default = pkgs.mkShell {
          buildInputs = [ zig pkgs.zls ];
        };
      }
    );
}

project flake.lock

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1741673466,
        "narHash": "sha256-VVXaC6uiwDMabeJE0iz3PmPj6UPrUa2naPT3Yi6ucpA=",
        "owner": "nixos",
        "repo": "nixpkgs",
        "rev": "8bf6db44e9869a9bc97fb1a7ffb861a15882eae4",
        "type": "github"
      },
      "original": {
        "owner": "nixos",
        "repo": "nixpkgs",
        "type": "github"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      }
    }
  },
  "root": "root",
  "version": 7
}

Additional Informations

zls-0.13.0 comes first, echo $PATH in neovim:

/nix/store/4zl0m2kisdpy5padk4i8wn6wf041dj5m-zls-0.13.0/bin
...
/nix/store/dh51hvagkd76nlixh4y79k8hl273847w-zig-0.14.0/bin
/nix/store/nn1v1aqacd09i9fzbirqzsy4sh0vnyqv-zls-0.14.0/bin
...

[pseudocc]

Probly related to this "--prefix" line

      extraWrapperArgs = builtins.concatStringsSep " " (
        (optional (
          config.extraPackages != [ ]
        ) ''--prefix PATH : "${lib.makeBinPath config.extraPackages}"'')
        ++ (optional config.wrapRc ''--add-flags -u --add-flags "${initFile}"'')
      );