Custom post type - disabling query_var gets 404?

I don't want my custom post type to be loaded by using query string at ?{query_var}={post_slug}. So I have set the argument below in my custom post type:

'query_var' = false,

But this gives me a 404 page when I load my custom post type page using clean URL, for examples:

/news/news-sample-1/
/news/news-sample-2/
/news/news-sample-3/

Why? What have I set wrong? Below is my custom post type declaration:

function news_init() {
    $args = array(
        'labels' = array(
            'name' = __('News (Pages)'),
            'singular_name' = __('News'),
            'all_items' = 'All News'
       ),
        'public' = true,
        'show_ui' = true,
        'capability_type' = 'page',
        'hierarchical' = true,
        'rewrite' = array(
            'slug' = 'news',
            'with_front' = true
        ),
        'query_var' = false,
        'menu_icon' = 'dashicons-star-filled',
        );
    register_post_type('news', $args);
}
add_action('init', 'news_init');

Any ideas?

Or is it a WP bug? I do exactly what it says on the doc.