Why is cart content not being passed in Woocommerce?

Question

WordPress

I want to pull out the data from the shopping cart to send it to CRM, but I check it by email and the Name and Phone number come, but I can’t get the contents of the cart... Please tell me where can there be an error?

add_action( 'woocommerce_new_order', 'sender_for_wc_order' );
function sender_for_wc_order($order_id) {

   $order = wc_get_order( $order_id);
   $data = $order->get_data(); // данные заказа

   $user_name = $data['billing']['first_name'];
   $user_phone = $data['billing']['phone'];

   $order_items = $order->get_items();

  foreach( $order_items as $item_id => $item ){

    $item_id = $item->get_id();

    $item_name = $item->get_name();
    $item_type = $item->get_type();

    $product_id = $item->get_product_id();
    $wc_product = $item->get_product();

    $item_data = $item->get_data();

    $info .= $item_data['name'];
    $info .= $item_data['product_id'];
    $info .= $item_data['variation_id'];
    $info .= $item_data['quantity'];
    $info .= $item_data['tax_class'];
    $info .= $item_data['subtotal'];
    $info .= $item_data['subtotal_tax'];
    $info .= $item_data['total'];
    $info .= $item_data['total_tax'];
  }

   mail('[email protected]', 'test', 'Имя: '.$user_name.' | Телефон: '.$user_phone.' | Details: '.$info);

}