Routing for subdomain called instead of default method

Hi, I'm trying to make a web that support subdomain for user. My route has something like this

PHP Code:

$routes->setDefaultNamespace('App\Controllers');
$routes->setDefaultController('Home');
$routes->setDefaultMethod('index');
$routes->setTranslateURIDashes(false);
$routes->set404Override();
$routes->setAutoRoute(true);

$routes->get('(:any)', 'App\Errors::show404', ['subdomain' => '*']); 


Using that route when I open subdomain (say sub.example.com) it will show 404 page which is work as expected. But now when I open the homepage (example.com) it will show 404 page instead of default method.
When I comment the $routes->get('(:any)', 'App\Errors:: show404', ['subdomain' => '*']); line, my homepage will show the default method.