What is blocking the display of Google maps?

Question

JavaScript

I've been fighting for the third day, but I can't track the bug.
The bottom line is simple - I decided to insert Goole maps into posts with my hands, I export all the marks from Google my map to kml and upload them to the map. The problem is that everything works on the pages, but not on the posts. I can't figure out what code is blocking the loading of the map layer
site2max.ru/tunis-otzyiv-ob-otdyihe-na-ostrove-dzh... - it doesn't work here
The code is very easy to insert. On the page:

<!--  сюда вставляется карта, здесь же заданы из какого файла подгружать точки и центр-->
<div id="stm-map" style="widht: 100%; height: 400px;" data-url="http://site2max.ru/wp-content/plugins/stm-map/Jerba_kmz.kmz" data-lat="33.801037" data-lng="10.882338" data-zoom="11"></div>
<!--  сам файл с функцией, он описан ниже-->
<script src="http://site2max.ru/wp-content/plugins/stm-map/map.js"></script>
<!--   подгрузка Google map Api -->
<script src="https://maps.googleapis.com/maps/api/js?key=MyAPIKey&amp;callback=initMap" async="" defer="defer"></script>

function initMap() {

  var mapID = document.getElementById('stm-map'); // Находим карту
  var mapData = mapID.dataset; // Берем атрибуты и переводим все в цифры

  var lat = Number( mapData.lat.valueOf() );
  var lng = Number( mapData.lng.valueOf() );
  var zoom = Number( mapData.zoom.valueOf() );
  var mapCenter = {lat: lat, lng: lng};
         
  var map = new google.maps.Map(mapID, {
    center: mapCenter,
    zoom: zoom
  });
// Подгружаем наш файл с точками
  var ctaLayer = new google.maps.KmlLayer({ 
    url: mapData.url,
    preserveViewport: true,
    map : map
  });
}

All paths are absolute, all files are opened. The problem is in the posts. What could be? Thanks in advance