Yes, this the plugin I am using.
It is not directly the unzer Plugin, it is the Print Invoice & Delivery Notes for WooCommerce Plugin.
/**
* Add a guest access token to the order.
*/
add_action( 'woocommerce_checkout_create_order', 'add_guest_access_token_to_order', 10, 2 );
add_action( 'woocommerce_store_api_checkout_update_order_meta', 'add_guest_access_token_to_order_blocks', 10, 1 );
This is forcing unzer to recreate the order several times.
