Corrupted compiled interface after `dune build`

Hey, I’m using VSCode and seeing an error when using the OCaml extension on my files: I’m trying to run the OCaml version into v5.1.1.

Corrupted compiled interface ~/.opam/5.1.1/lib/ocaml/stdlib.cmi

In case, I can run the dune build without any problem and it can be executed, but I’m trying to understand why it’s happening? Any idea why?

BTW, I’m using macOS + Nix Flakes to run this OCaml project. I put here how my flake.nix has been wrote:

{
  description = "A development environment for ocaml";

  inputs = {
    nixpkgs.url = "github:nix-ocaml/nix-overlays";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages."${system}".extend (self: super: {
          ocamlPackages = super.ocaml-ng.ocamlPackages_5_1;
        });
        ocamlPackages = pkgs.ocamlPackages;
        packages = [
          ocamlPackages.brr
          ocamlPackages.utop
          ocamlPackages.ocamlformat
          ocamlPackages.ocaml
          ocamlPackages.dune
          ocamlPackages.opam
          ocamlPackages.ocaml-lsp
          ocamlPackages.merlin
        ];
      in
      {
        formatter = nixpkgs.legacyPackages.x86_64-linux.nixpkgs-fmt;
        defaultPackage = pkgs.stdenv.mkDerivation {
          name = "ocamlbyexample";
          src = ./.;
        };

        devShell = pkgs.mkShell {
          nativeBuildInputs = with pkgs.ocamlPackages; [ cppo findlib ];

          buildInputs = with pkgs; [
            packages
            caddy
            curl
            wget
          ];

          shellHook = ''
            export OPAMCURL="curl"
          '';
        };
      }
    );
}

Any idea how to debug it and why it’s happening?

I think that can have some relationship with my setup, because when I run the opam install ppx_inline_test, it display a similar error related to:

# File "src/sexp.mli", line 1:
# Error: The files ~/.opam/5.1.1/lib/ocaml/stdlib.cmi
#        and /nix/store/hash-ocaml5.1.1-sexplib0-0.17.0/lib/ocaml/5.1.1/site-lib/sexplib0/sexplib0.cmi
#        make inconsistent assumptions over interface Stdlib

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