Woocommerce how to set default_checkout_billing_country only if user is not logged in

I have this function and I only want to set the billing country if user is a guest, otherwise we should not change the billing country, but instead take the billing country as what the user has in his profile in WooCommerce.

add_filter( 'default_checkout_billing_country', 'bbloomer_change_default_checkout_country' );
 
function bbloomer_change_default_checkout_country() {
  return 'US'; 
}

You could use is_user_logged_in:

add_filter( 'default_checkout_billing_country', 'bbloomer_change_default_checkout_country' );
 
function bbloomer_change_default_checkout_country($default) {

  if(is_user_logged_in()){
    return $default;
  }else{
    return 'US';
  };
   
};

However, sometimes, because of caching issues, is_user_logged_in doesn't work. In that case then you could use global $current_user.

add_filter( 'default_checkout_billing_country', 'bbloomer_change_default_checkout_country' );

function bbloomer_change_default_checkout_country($default) {

  global $current_user;

  if($current_user->ID){
    return $default; 
  }else{
    return 'US';
  };
  
};

Let me know if you could get it to work!