bagisto/packages/Longyi/DynamicMenu/src/Config/menu.php

<?php

return [
    // 直接返回菜单数组，不要再用 admin 键包裹
    [
        'key' => 'settings.dynamicmenu',
        'name' => '动态菜单',
        'route' => 'admin.dynamicmenu.index',
        'sort' => 10,
        'icon' => 'icon-menu',
    ],
    [
        'key' => 'settings.dynamicmenu.menu',
        'name' => '菜单项管理',
        'route' => 'admin.dynamicmenu.index',
        'sort' => 1,
        'icon' => 'icon-list',
        'parent' => 'settings.dynamicmenu'
    ],
    [
        'key' => 'settings.dynamicmenu.permission',
        'name' => '菜单权限',
        'route' => 'admin.dynamicmenu.permission',
        'sort' => 2,
        'icon' => 'icon-lock',
        'parent' => 'settings.dynamicmenu'
    ],
];