Toolbar Hidden in a Virtual Page

The admin bar is initialized on template_redirect. You must be short-circuiting that.

The quick and dirty method would be to run _wp_admin_bar_init(); near the top of your page.

add_filter('wp_title', function($title, $sep, $seplocation) { return 'Register'; }, 10, 2);

_wp_admin_bar_init(); // <- this <-

get_header();
get_template_part('includes/breadcrumbs');
get_template_part('includes/top_info');

It would be somewhat neater to simply hook your function to template_redirect instead, though, and unless you have compelling reasons to be using the somewhat odd hook choice of parse_query, that is what I’d recommend.

add_action( 'template_redirect', function()
{
    global $wp_query;
    if (array_key_exists('virtualpage', $wp_query->query_vars))
    {
        switch ($wp_query->query_vars['virtualpage'])
        {
            case '1' :
                include 'page-register.php';
                break;
        }
        exit();
    }
    return;
});