Custom Post Type – Category Rewrite – Remove Rewrite from Sitemap

I’ve got “case_studies” post type and categories for it as “case_studies_categories” with a rewrite to include category in URL.

Everything works, but for some reason, rewrite url is in sitemap (as the first URL), for example:

/case-studies/%case_studies_categories%/ 

and the rest is fine:

/case-studies/%case_studies_categories%/ /case-studies/category-name/post-name/ /case-studies/category-name/post-name/ /case-studies/category-name/post-name/ 

How to remove it (/case-studies/%case_studies_categories%/) from Sitemap?

    add_action('init','case_studies_init');  function case_studies_init(){      $  labels = array(         'name'               => _x( 'Case Studies', 'Case Studies' ),         'singular_name'      => _x( 'Case Study', 'Case Study' ),         'add_new'            => _x( 'Add Case Study', 'Case Study' ),         'add_new_item'       => __( 'Add Case Study' ),         'edit_item'          => __( 'Edit Case Study' ),         'new_item'           => __( 'New Case Study' ),         'all_items'          => __( 'All Case Study' ),         'view_item'          => __( 'View Case Study' ),         'search_items'       => __( 'Search Case Study' ),         'not_found'          => __( 'No Case Studies Found' ),         'not_found_in_trash' => __( 'No Case Studies in Trash' ),         'parent_item_colon'  => '',         'menu_name'          => 'Case Studies'     );     $  args = array(         'labels'                => $  labels,         'description'           => 'Holds case studies post data',         'public'                => true,         'menu_position'         => 7,         'hierarchical'          => true,         'menu_icon'             => 'dashicons-admin-comments',         'rewrite'               => array('slug' => 'case-studies/%case_studies_categories%', 'with_front' => false),         'supports'              => array( 'title', 'revisions', 'thumbnail'),         'has_archive'           => true,         'show_ui'               => true,         'show_in_nav_menus'     => true,         'show_in_menu'          => true,         'show_in_admin_bar'     => true,         'taxonomies'            => array("case_study_categories"),     );      register_post_type('case_studies',$  args);   //  flush_rewrite_rules( false ); }  // register a custom category taxonomy type // so that the categories are not connected to the 'post' type taxonomies  add_action( 'init', 'register_case_study_tax' );  function register_case_study_tax(){      $  labels = array(     'name'              => _x( 'Case Study Categories', 'case-studies'),     'singular_name'     => _x( 'Case Study Category', 'testimonials'),     'search_items'      => __( 'Search Case Study Categories'),     'all_items'         => __( 'All Case Study Categories'),     'parent_item'       => __( 'Parent Case Study Category'),     'parent_item_colon' => __( 'Parent Case Study Category:'),     'edit_item'         => __( 'Edit Case Study Category'),     'update_item'       => __( 'Update Case Study Category'),     'add_new_item'      => __( 'Add Case Study Category'),     'new_item_name'     => __( 'New Case Study Category'),     'menu_name'         => __( 'Case Study Categories'),     );      $  args = array(     'labels'                => $  labels,     'taxonomy'              => 'case_study_categories',     'object_type'           => 'case_studies',     'hierarchical'          => true,     'show_ui'               => true,     'show_admin_column'     => true,     'query_var'             => false,     );      register_taxonomy('case_studies_categories', 'case_studies', $  args); }   /** filter URL link for post type url **/ add_filter('post_type_link', 'case_studies_permalink_structure', 10, 4);  function case_studies_permalink_structure($  post_link, $  post, $  leavename, $  sample) {   if ( false !== strpos( $  post_link, '%case_studies_categories%' ) ) {     $  event_type_term = get_the_terms( $  post->ID, 'case_studies_categories' );     if($  event_type_term)     $  post_link = str_replace( '%case_studies_categories%', array_pop( $  event_type_term )->slug, $  post_link );    }  return $  post_link; } 

I’m sure I’ve done something stupid, please assist if possible.

Thanks,