Error after upgrading to 7.x-3.0-rc7

Same issue here. Also using PHP 7.4.33.

Revert to 7.x-3.0-rc6 and problem gone.

admin_menu.inc function admin_menu_tree_dynamic(array $expand_map) {

    else {
/*WTpatch: Notice: Undefined offset: 29 in admin_menu_tree_dynamic() (line 125 of /var/.../sites/all/modules/admin_menu/admin_menu.inc).*/
      //$parent_path = $result[$link['plid']]['path'];
      //$parent_path = $result[$link['plid']]['path'] ?? false; //$result[$link['plid']]['path'];
      if( isset($result[$link['plid']]['path']) ) $parent_path = $result[$link['plid']]['path']; else continue;
/*<<<*/
    }

    $tree_dynamic[$parent_path][] = $link;
  }