Nixpkgs-review on new rust package results in package broken

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I’m trying to package a Rust application and when I try to run nixpkgs-review, it results in a “1 package marked as broken and skipped” error which is the package I am trying to add. I have not specified in the derivation if it’s broken, so how do I go about figuring out why it’s marked broken?
This is the derivation that I’m trying which builds fine with nix-build.

{ lib, rustPlatform, fetchFromGitHub }:

rustPlatform.buildRustPackage rec {
  pname = "fblog";
  version = "3.0.2";

  src = fetchFromGitHub {
    owner = "brocode";
    repo = pname;
    rev = "v${version}";
    sha256 = "sha256-1Q52YTfQp9HXuOe3gxWgE+YM10VGzyog42lv0CLwNWQ=";
  };

  cargoSha256 = "sha256-XYTRq115QRd2vJ9jr+vkz+J/YdwCJ5az29VthJlhFPw=";

  doInstallCheck = true;
  installCheckPhase = ''
    $out/bin/fblog --help > /dev/null
  '';

  meta = with lib; {
    description = "A small tool to view json log files.";
    homepage = "https://github.com/brocode/fblog";
    license = licenses.wtfpl;
    platforms = platforms.linux;
    maintainer = [ maintainers.iammrinal0 ];
  };
}