Not able to search by keyword in popup library?

Hi,

We are using your plugin on a new website we have under development.

We don’t seem to be able to search results by keyword when using the media library popup from within a page/post (Adding a Featured Image, Modifying Yoast’s Facebook/Twitter image etc). The search results state “No items found.” However, when I search by the same keyword within the default WP media library (/wp-admin/upload.php) and Media Library Folders Pro (/wp-admin/admin.php?page=media-library-folders), the keyword does return results.

Is this a known issue or is there a server setting we need to change in order to have this functionality work?