Custom search for custom post meta with pre_get_posts interferes with WP search

Create a another filter to remove post title and post content remove search terms
try this if this helpful for you

add_filter( 'posts_search', 'custom_post_search_author_do', 10, 2 );

function custom_post_search_author_do($search, $query ){
  if(  ! empty($search) 
       && $query->is_main_query() 
       && !is_admin() 
       && isset($_GET['search-type'])
       && $_GET['search-type'] == 'autor'
  )
  $search="";
  return $search;
}