Javascript 从WooCommerce Checkout Country字段重新排序国家，保持国家同步

The Issue
I'm working on customizing the WooCommerce checkout page by reordering the countries in the billing_country and shipping_country dropdown fields. I've achieved this by using the woocommerce_checkout_fields filter to modify the fields' options.

然而，在进行这些自定义之后，我面临着一个问题，即当更改billing_country字段时，billing_state字段不能正确更新.州/省选项保持不变，无论所选国家.

Current Code (Previous Stackoverflow Post)
Here's the code I'm using to reorder the countries and apply the Select2 (selectWoo) functionality:

// Reorder and customize the country dropdowns
add_filter('woocommerce_checkout_fields', 'reorder_checkout_country_dropdowns');
function reorder_checkout_country_dropdowns($fields)
{
    $countries_array = array_merge(
        array(
            'DE' => 'Germany',
            'AT' => 'Austria',
            'CH' => 'Switzerland',
            '-' => '------------',
        ),
        WC()->countries->get_allowed_countries()
    );

    $fields['billing']['billing_country']['type'] = $fields['shipping']['shipping_country']['type'] = 'select';
    $fields['billing']['billing_country']['options'] = $fields['shipping']['shipping_country']['options'] = $countries_array;

    return $fields;
}

// Enqueue JavaScript to apply Select2 functionality
add_action('woocommerce_checkout_init', 'enable_back_selectWoo_on_countries_dropdowns');
function enable_back_selectWoo_on_countries_dropdowns()
{
    wc_enqueue_js("$('#billing_country,#shipping_country').selectWoo();");
}

Attempted Solutions
This code reorders the countries in the dropdowns and applies the Select2 (selectWoo) functionality. However, it doesn't address the issue with the billing_state field not updating correctly when the billing_country is changed.

我try 过各种方法，比如在billing_country字段中添加一个事件侦听器并相应地更新billing_state字段，但我还没有找到一个一致工作的解决方案.

The Question
How can I ensure that the billing_state field updates with the correct state/province options when the billing_country field is changed, even after customizing the country dropdown?

Image example to show the issue

如上图所示，当WooCommerce checkout 时，"奥地利—奥地利"被选为账单国家时，州 Select 字段错误地显示了"德国"的州/省，而不是奥地利的州/省.

当我注释掉第二行add_filter('woocommerce_checkout_fields', 'reorder_checkout_country_dropdowns');时，这个问题没有发生.