Production flag ignored in mix.bless

Has anyone encountered when running gulp --production that bless will use the unminifed css?

I can't believe that no-one has this issue?

gulp file looks like this:

// the config.get is a wrapper that pulls in a path from a config file

 console.log(
        config.get('scss.0.in', 'scss'),
        config.get('scss.0.out', 'css'),
        config.get('bless.0.in', 'css'),
        config.get('bless.0.out', 'css')
    );

mix.sass(config.get('scss.0.in', 'scss'), config.get('scss.0.out', 'css'), {sourceComments: true})
        .sass(config.get('scss.1.in', 'scss'), config.get('scss.1.out', 'css'))
        .sass(config.get('scss.2.in', 'scss'), config.get('sass.2.out', 'css'))
        .sass(config.get('scss.3.in', 'scss'), config.get('scss.3.out', 'css'))
        .sass(config.get('scss.4.in', 'scss'), config.get('scss.4.out', 'css'))
        // it's not using the minified css from the steps prior...
        .bless(config.get('bless.0.in', 'css'), config.get('bless.0.out', 'css'), {imports: true})
        .browserSync({
            files: ["../../public/**/*.css", "../../public/**/*.js", "../../public/**/*.php"],
            proxy: "website.app",
            port: 4000,
            logPrefix: "Laravel Eixir BrowserSync"
    });

// ...etc...

console.log generates:

./resources/assets/sass/main.scss 
./../../public/alpha/css/main.css 
[ './../../public/alpha/css/main.css' ] 
./../../public/alpha/blessed.css

Anyone else have this issue?