Newsletters can no longer be accessed

Hi,
since the last update, the last newsletters can no longer be called up. This is the link: https://www.waldschule-degerloch.de/index.php/schulprofil/newsletter-archiv/listid-1/mailid-514-waldschule-rundbrief-nr-610
What can I do to solve the problem?
ACYmailing 5.10.27 / Joomla 3.10.6 / PHP 7.4.28
Regards Fred

Please open a support ticket using our contact form, so we can take a look