Unable to shoe recent custom post types in default recent posts widget

I have custom post type “books” and there are already ‘books’ added.
However, I am unable to modify WP_Query to change Recent Posts widget.
I know that there is filter to modify WP_Query args:

add_filter( 'widget_posts_args', 'wp130512_recent_posts_args');
function wp130512_recent_posts_args($args) {
    $args['post_type'] = array('post', 'books');
    return $args;
}

But unforutunately this doesn’t work. I have even tried to mdoify default-widgets.php (just for test) directly and it doesn’t show any ‘books’ (just ‘posts’).

I even have tried to add this code (just for test) into default-widgets.php, but it shows nothing. If I add the exect code to my front page (front-page.php), then it shows “books”.

<?php
$queryObject = new WP_Query( 'post_type=books&posts_per_page=5' );
// The Loop!
if ($queryObject->have_posts()) {
    ?>
    <ul>
    <?php
    while ($queryObject->have_posts()) {
        $queryObject->the_post();
        ?>

        <li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
    <?php
    }
    ?>
    </ul>
    <div><a href="#">View More</a></div>
    <?php
}
?>

So, what is the reason I cannot get custom post types inside this widget?

Read more here: Unable to shoe recent custom post types in default recent posts widget

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