Resolve conflict with YITH Product Addons and WooCommerce Subscriptions

functions.php

<?php

/**
 * Resolve conflict with YITH Product Addons and WooCommerce Subscriptions
 * Fixes issue where renewal orders are left unpaid upon checkout and a new parent order and subscription is created.
 *
 * @author support@yith.com
 */

remove_filter( 'woocommerce_order_again_cart_item_data', array( 'YITH_WAPO_Frontend', 're_add_cart_item_data' ), 10, 3 );