Invisible Pending Comments

I have the same problem. it happens only when i submit a post from the frontend as a custom post type.
this is the code i use for the submitting form in the frontend.

//Post Properties
    $new_post = array(
            'post_title'    => $title,
            'post_content'  => $description,
            'post_status'   => 'pending',           // Choose: publish, preview, future, draft, etc.
            'post_type' => 'index'  //'post',page' or use a custom post type if you want to
    );
    //save the new post
    $pid = wp_insert_post($new_post);