Filter orders by modify date

I’m trying to add a new filter that will sort orders by modification date. Below is the code I found and modified. Unfortunately, filtering doesn’t work, returns zero results.I think the problem is with $ filter_id

function get_filter_shop_order_meta( $  domain = 'woocommerce' ){     // Add below the metakey / label pairs to filter orders     return [         'last_modified' => __('Recently updated', $  domain)     ]; }   add_action( 'restrict_manage_posts', 'display_admin_shop_order_by_meta_filter' ); function display_admin_shop_order_by_meta_filter(){     global $  pagenow, $  typenow;      if( 'shop_order' === $  typenow && 'edit.php' === $  pagenow ) {         $  domain    = 'woocommerce';         $  filter_id = 'filter_shop_order_by_meta';         $  current   = isset($  _GET[$  filter_id])? $  _GET[$  filter_id] : '';          echo '<select name="'.$  filter_id.'">         <option value="">' . __('Sort by…', $  domain) . '</option>';          $  options = get_filter_shop_order_meta( $  domain );          foreach ( $  options as $  key => $  label ) {             printf( '<option value="%s"%s>%s</option>', $  key,                  $  key === $  current ? '" selected="selected"' : '', $  label );         }         echo '</select>';     } }   add_filter( 'request', 'process_admin_shop_order_marketing_by_meta', 99 ); function process_admin_shop_order_marketing_by_meta( $  vars ) {     global $  pagenow, $  typenow;          $  filter_id = 'filter_shop_order_by_meta';      if ( $  pagenow == 'edit.php' && 'shop_order' === $  typenow      && isset( $  _GET[$  filter_id] ) && ! empty($  _GET[$  filter_id]) ) {         $  vars['meta_key']   = $  _GET[$  filter_id];         $  vars['orderby']    = 'ASC';     }     return $  vars; }   add_filter( 'woocommerce_shop_order_search_fields', 'shop_order_meta_search_fields', 10, 1 ); function shop_order_meta_search_fields( $  meta_keys ){     foreach ( get_filter_shop_order_meta() as $  meta_key => $  label ) {         $  meta_keys[] = $  meta_key;     }     return $  meta_keys; } 

I will be grateful for your help.