Default Values not saving

• bob404

• June 17, 2025 at 5:31 pm

I’m using the following code to pre-populate the default values of a Link field:

add_filter('acf/load_field/key=field_681bd616fc827', function ($field) {
  if(!is_admin()){
    return $field;
  }

  if (get_post_type() === 'webinar' && !isset($_GET['post'])) {
    $field['default_value'] = array(
      'title' => 'Register',
      'url' => '#webinar-signup',
      'target' => '_self',
    );
  }
  return $field;
});

In the editor, it shows these values are populated, but when I save as draft OR publish, those default values are not being saved. Returning to edit the post shows the field as empty.

Any ideas?