add_filter( 'woocommerce_order_item_get_formatted_meta_data', function( $formatted_meta ) {
    if( !empty( $formatted_meta ) ) {
        foreach( $formatted_meta as $meta_id => $meta ) {
            if( isset( $meta->key ) && in_array( $meta->key, array( 'wcfm_tracking_code', 'wcfm_tracking_url' ) ) ) {
                unset( $formatted_meta[$meta_id] );
            }
        }
    }
    return $formatted_meta;
}, 51 );