[Resolved] WP JSON Request Infinite Load Issue

Hello!

I am developing our site and I have a problem.

What am I doing?

I need to create a request to the site's API using WP_JSON. In this request, an operation is performed to obtain the values of the custom fields of the post/page. I have a list of fields (about 100) like: title, description, _edit_last etc. I iterate over an array with a list of the names of these fields using a foreach loop and try to get the value using the get_post_meta () function. Here is a piece of code:

<?php
 
$postId = 100;
$fields = ["title", "description", "_edit_last", ...];
 
foreach ($fields as $field) {
    $value = get_post_meta($postId, $field, true);
    ...
}

When I send a request through Postman, the request itself hangs, as if it is in some kind of recursion.

After profiling, I managed to find out that the get_post_meta() function has a "get_post_metadata" hook, which is subscribed to by the "WPML Multilingual CMS" code. I even managed to find a problematic place. It is located in the file: plugins/sitepress-multilingual-cms/classes/custom-field-translation/class-wpml-translate-link-targets-in-custom-fields.php on line 57. There is this code snippet:

$this->wp_api->remove_filter( 'get_post_metadata', array( $this, 'maybe_translate_link_targets' ), 10 );
$metadata_raw = maybe_unserialize( $this->wp_api->get_post_meta( $object_id, $meta_key, $single ) );
$this->wp_api->add_filter( 'get_post_metadata', array( $this, 'maybe_translate_link_targets' ), 10, 4 );

In which, if you comment out: "$this->wp_api->add_filter( 'get_post_metadata', array( $this, 'maybe_translate_link_targets' ), 10, 4 );", then the problem disappears. It seems that due to some conditions, this code loops, which breaks our request.

Additionally, I noticed that my local Apache server is heavily CPU intensive at the time of the problem, sometimes reaching 100%, and this happens even if the API request is canceled. Only restarting the web server helps.

I also recorded a video where the problem is clearly visible: hidden link

We are currently using WPML Multilingual CMS 4.6.3

I look forward to your help in this matter, thanks!