How to use calculation function after database update on Woocommerce? - wordpress

Question

I am making changes to some data after the order. Transactions are taking place in the database. There is no problem. But the problem is recalculating the order amount.
If I run the relevant function (calculate_totals) elsewhere, the calculation takes place. But it is not happening in example_function. There are no errors in the code. It works without problems.
My code is as follows:
//...
add_action( 'template_redirect', [ $this, 'example_function' ], 10 );
//...
function example_function() {
foreach ($order->get_items() as $item_id => $item) {
wc_update_order_item_meta( $item_id, '_line_tax', $new_value1));
wc_update_order_item_meta( $item_id, '_line_total',$value2));
//...
}
//Save and finish
$order->calculate_totals();
$order->save();
wc_add_notice( __( 'Successful', 'text-domain' ), 'success' );
wp_redirect( wc_get_account_endpoint_url( 'new-page' ) );
exit();
}
For example, then, calculation occurs later with a definition like the following.
add_action( 'woocommerce_view_order', 'example_view_order', 20 );
function example_view_order($order_id){
$order = wc_get_order($order_id);
//Save and finish
$order->calculate_totals();
}
Update:
A few hours later I found a thread like this: StackOverLink
I guess the order_item_meta functions are running asynchronously. Probably the problem is caused by that. However, a solution has not been found.