Confirmed - might help someone find the problem but if the menu has no menu items it can be exported and shows the problem ?

<code>403</code>
<message>You don't have permission to access this. Please contact a website administrator if this is incorrect.</message>
<trace>#0 C:\htdocs\joomla-cms\libraries\src\MVC\Controller\BaseController.php(730): Joomla\Component\Login\Administrator\Controller\DisplayController->display() #1 C:\htdocs\joomla-cms\libraries\src\Dispatcher\ComponentDispatcher.php(146): Joomla\CMS\MVC\Controller\BaseController->execute('') #2 C:\htdocs\joomla-cms\administrator\components\com_login\src\Dispatcher\Dispatcher.php(43): Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() #3 C:\htdocs\joomla-cms\libraries\src\Component\ComponentHelper.php(389): Joomla\Component\Login\Administrator\Dispatcher\Dispatcher->dispatch() #4 C:\htdocs\joomla-cms\libraries\src\Application\AdministratorApplication.php(143): Joomla\CMS\Component\ComponentHelper::renderComponent('com_login') #5 C:\htdocs\joomla-cms\libraries\src\Application\AdministratorApplication.php(186): Joomla\CMS\Application\AdministratorApplication->dispatch() #6 C:\htdocs\joomla-cms\libraries\src\Application\CMSApplication.php(278): Joomla\CMS\Application\AdministratorApplication->doExecute() #7 C:\htdocs\joomla-cms\administrator\includes\app.php(63): Joomla\CMS\Application\CMSApplication->execute() #8 C:\htdocs\joomla-cms\administrator\index.php(32): require_once('C:\\htdocs\\jooml...') #9 {main}</trace>
</error>

Same in J3

please test #34746 for Joomla 4

for Joomla 3 I can backport, later