[Support request] Static Pages as Author Archives

Hi

I use this snippet for static pages as Author Archives.

add_filter('request', function( array $query_vars ) {
//    if ( is_admin() ) {
  //      return $query_vars;
 //   }

    if ( isset( $query_vars['author_name'] ) ) {
        $pagename = $query_vars['author_name'];

        $query_vars = array( 'pagename' => "$pagename" );
    }

    return $query_vars;
} );

It worked great for me, but not when there is one user, he is both an administrator and a post author.
(I deleted my other users: I had created several with different e-mails, and changed the authors of the posts)
My posts and WPSP posts lists author links returns https://www.sisla.lt/author/admin/
but not https://www.sisla.lt/rolandas-sisla/ author page link.
(I use GP PRO and WP Show Posts Pro, both latest versions)

Maybe you can advise what to do?