thank you, we solved it by editing two functions in our childtheme:
remove_action( ‘woocommerce_order_status_changed’, array( ‘Hooks’, ‘on_sub_order_change’ ), 99 );
remove_action( ‘woocommerce_order_status_changed’, array( ‘Hooks’, ‘on_order_status_change’ ), 10,4 );
there we changde the updat_status to a custom status
thank you for you help