Why my query is not “Main_query”?

And the anwser to my question: Don’t make new WP_Query object. Don’t try to overwrite main query. Use global $wp_query; In my example the function should be like this:

public function askanban_display_board(){
    global $wp_query;
    $wp_query->set('post_type', 'ticket');
    $wp_query->set('posts_per_page', -1);
    $posts = $wp_query->get_posts();
    print_r($posts);
}