PHP Code is not working anymore after Joomla Update

Christopher Plau

Hello,
after an update from Joomla 3.10.11 to Joomla 5.0.2, the following code

<?php 
if  (isset($_SERVER['HTTP_X_GT_LANG'])) {
   echo "<h2>Doha Ausflüge & Aktivitäten GetYourGuide</h2>";  
   echo '<div data-gyg-href="https://widget.getyourguide.com/default/activities.frame" data-gyg-location-id="1885" data-gyg-locale-code="de-DE" data-gyg-widget="activities" data-gyg-number-of-items="4" data-gyg-cmp="kp-doha" data-gyg-partner-id="3VYD9IE"></div>';
} else { 
    echo "<h2>Doha Meine Landausflüge</h2>";
   echo ' <div class="col-md-12" id="widget-main-tripup" data-customer="TA1096" data-channel="kp-doha" data-cruisetype="sea" data-components="itinerary, products" data-port_id="743" data-shortproducts="false" data-showtitles="false" data-showport="true"></div> <script async defer type="text/javascript" data-containers="widget-main-tripup" src="https://widget.meine-landausfluege.de/itinerary/js/main.min.js"></script> ';
}
?>
{/source>

is no working any more. I add Code to a module position via a module and "Prepare content" is activated.

In Joomla 5 i tried to put {source}{/source} around the code, but then it doesn't work either

An example page of my website is: www.kreuzfahrt-praxis.de/joomla5/kreuzfahrt-ziele/doha-katar
It should appear at the bottom of the page below "January 2024"

On my old Joomla 3 Site it works fine:
www.kreuzfahrt-praxis.de/kreuzfahrt-ziele/doha-katar

Do you have an idea what the problem could be?