Is this a bug? gobject-introspection assumes dynamic linking

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I’m using the flake below to attempt getting a statically linked build of qt6. It fails with this error, that makes it look like the gobject-introspection package has hard coded references to shared library outputs. Is this expected? I don’t know what the nixpkgs policy is for whether packages have to work with static linking, it would be really useful though (for using NixOS to build binaries that work on any distro) if it worked.

$ nix develop --option cores 4
error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:34:12:
           33|
           34|   strict = derivationStrict drvAttrs;
             |            ^
           35|

       … while evaluating derivation 'nix-shell-x86_64-unknown-linux-musl'
         whose name attribute is located at /nix/store/lv9bmgm6v1wc3fiz00v29gi4rk13ja6l-source/pkgs/stdenv/generic/make-derivation.nix:333:7

       … while evaluating attribute 'nativeBuildInputs' of derivation 'nix-shell-x86_64-unknown-linux-musl'
         at /nix/store/lv9bmgm6v1wc3fiz00v29gi4rk13ja6l-source/pkgs/stdenv/generic/make-derivation.nix:377:7:
          376|       depsBuildBuild              = elemAt (elemAt dependencies 0) 0;
          377|       nativeBuildInputs           = elemAt (elemAt dependencies 0) 1;
             |       ^
          378|       depsBuildTarget             = elemAt (elemAt dependencies 0) 2;

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute 'sharedLibrary' missing
       at /nix/store/lv9bmgm6v1wc3fiz00v29gi4rk13ja6l-source/pkgs/development/libraries/gobject-introspection/default.nix:161:33:
          160|   postCheck = ''
          161|     rm $out/lib/libregress-1.0${stdenv.targetPlatform.extensions.sharedLibrary}
             |                                 ^
          162|   '';

{
  description = "Example C++ environment with musl + static using legacyPackages";

  inputs = {
    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.2405.*.tar.gz";
  };

  outputs = { self, nixpkgs }: let
    system = "x86_64-linux";

    # Custom overlay with compiler flags
    compilerFlagsOverlay = final: prev: let
      isBootstrap = name: builtins.match "bootstrap-.*" name != null;
    in {
      stdenv = if isBootstrap prev.stdenv.name
               then prev.stdenv
               else prev.withCFlags [ "-frecord-gcc-switches" ] prev.stdenv;
    };

    # Base package set using legacyPackages
    basePkgs = nixpkgs.legacyPackages.${system};

    # Musl static package set with our overlay
    muslStaticPkgs = basePkgs.pkgsCross.musl64.pkgsStatic.extend compilerFlagsOverlay;

  in {
    devShells.${system}.default = muslStaticPkgs.mkShell {
      packages = with muslStaticPkgs; [
        hello
        qt6.qtbase
        qt6.qtcharts
      ];
    };
  };
}