[Resolved] WPML string plugin create a conflict for other plugin to work

Hi,

so your order plugin is adding custom logic related to WPML. The issue you’re seeing is caused by that custom logic hooks into woocommerce_order_status_changed. This same hook is also used by our WooCommerce Multilingual (WCML) plugin.

The problematic code is located here:
/wp-content/plugins/bp-custom-order-status-for-woocommerce/src/Email.php

Everything works correctly until the call to restore_previous_locale(). That call triggers a chain in WooCommerce Multilingual (WCML), specifically in:

\WCML_Emails::comments_language
/wp-content/plugins/woocommerce-multilingual/inc/class-wcml-emails.php

This method sets the locale to English because of a fallback condition. Once the locale is switched to English, the process is interrupted and no further emails are sent.

There’s one catch: this issue only appears if your WordPress admin top-bar language is set to Spanish. The reason is most likely that Post Status is a Custom Post Type (CPT). Since you’re using “Display as translated” mode without providing actual translations, the defaults remain in Spanish, which triggers the mismatch.

Workaround

As a workaround, you can add the following code snippet to your theme’s functions.php after a full backup:

add_action('woocommerce_order_status_changed', function () {
    $tag = 'woocommerce_order_status_changed';
    $prio = 10;

    $callbacks = $GLOBALS['wp_filter'][$tag]->callbacks[$prio] ?? [];
    foreach ($callbacks as $cb) {
        $f = $cb['function'];
        if (is_array($f) && is_object($f[0]) && $f[1] === 'comments_language') {
            remove_action($tag, $f, $prio);
        }
    }
}, 0);

This removes the WCML action that changes the locale when the other plugin calls restore_previous_locale(). With this in place, the process should complete correctly and your emails will be sent as expected.

Best regards,
Marcel

Sure!

Best Regards,
Marcel