使自定义WooCommerce状态可编辑

I created a new WooCommerce status: "Shipped" with the following code:

    /***********************************************
    ************************************************
    ************ Add WooCommerce Status ************
    ************************************************
    ***********************************************/

    function register_shipped_status() {
        register_post_status( 'wc-shipped', array(
            'label'                     => 'Shipped',
            'public'                    => true,
            'exclude_from_search'       => false,
            'show_in_admin_all_list'    => true,
            'show_in_admin_status_list' => true,
            'label_count'               => _n_noop( 'Versendet <span class="count">(%s)</span>', 'Versendet <span class="count">(%s)        </span>' )
        ) );
    }
    add_action( 'init', 'register_shipped_status' );

    // Add to list of WC Order statuses

    function add_shipped_to_order_statuses( $order_statuses ) {
        $new_order_statuses = array();

        // add new order status after processing
        foreach ( $order_statuses as $key => $status ) {
            $new_order_statuses[ $key ] = $status;
            if ( 'wc-processing' === $key ) {
                $new_order_statuses['wc-shipped'] = 'Versendet';
            }
        }
        return $new_order_statuses;
    }
    add_filter( 'wc_order_statuses', 'add_shipped_to_order_statuses' );

Works great. I have just one problem: If I want to edit an order, it is not possible, if I have selected my new order status.

I need the possibility to edit WooCommerce orders like orders which are "pending" or "on-hold". How can I achieve that?

I have already tried to change 'public' => false, but didn't work. Googled a lot, but found just someone with the same problem with no solution.

Any help appreciated.