Show future posts for logged-in users

i want to show the future posts only when a user is logged in.
The posts should not be display in any category, index page etc.
I link to the post with an own script/link.

this is my code

add_filter('the_posts', 'show_future_posts');
    function show_future_posts($posts)
    {
       global $wp_query, $wpdb;
       if(is_single() && $wp_query->post_count == 0)
       {
           if(is_user_logged_in())
           {
                $posts = $wpdb->get_results($wp_query->request);
                return $posts;
           }
           else
           {
                wp_redirect('https://domain.com/wp-login.php?action=register');
                exit();
           }
       }
    }

The problem is that i get an not found (Apologies, but no results were found for the requested archive. Perhaps searching will help find a related post. on the index.php page but i dont know why because in this line

if(is_single() && $wp_query->post_count == 0)

i say that the code only should run on an single page.
Can anybody help me please?