add_filter('wp_title') not working

[lpheller]

Setting up a page title for a custom route the way your documentation describes it (Setting the page title for custom routes) doesn't seem to be working anymore. At least for me it doesn't. And seeing that the
wp_title function got deprecated (Link), i guess this is the new appropriate way to solve this:

add_filter('document_title_parts', function (array $title_parts) {
    $title_parts['title'] = "Page Title";
    return $title_parts;
});