Laravel intended() not behaving as expected

Using Laravel 5.4. I have a custom front-end authentication middleware and login controller which works, apart from the post-login redirection. I am using Redirect::intended() to go to the originating page after logging in, but instead it goes to the default page.

Middleware:

public function handle($request, Closure $next, ...$guards)
{
    if (auth()->check() && (auth()->user()->is_public == 1)) {
        return $next($request);
    }
    return redirect('/client-login');
}

Controller:

use AuthenticatesUsers;

protected $redirectTo = '/';

public function __construct()
{
    $this->middleware('guest', ['except' => 'logout']);
}

protected function attemptLogin(Request $request)
{
    if (auth()->attempt(['email' => $request->email, 'password' => $request->password, 'is_public' => 1])) {
        return Redirect::intended($this->redirectTo);
    }
}

Route:

Route::group(['middleware' => ['frontend']], function() {
    Route::get('test', 'HomeController@test');
});

Users always get redirected to /. Instead I want them to be redirected to the page they were tryign to access before they got intercepted by the auth.

via GluePear