KMZ exported from google maps is not showing some placemarks - google-maps

Question

We have this map:
https://www.google.com/maps/d/viewer?mid=z3MgxTVp8WWA.kbMeY2NPElcE
It can be exported into KMZ, by clicking "Download KML":
But when I try to embed this map on my own Google Maps, or even open in Google Earth, some placemarks are not displayed:
It there any way to fix this issue?

Answer 1

I see that problem with the KmlLayer renderer for the Google Maps Javascript API v3:
fiddle
code snippet:
var geocoder;
var map;
function initialize() {
var map = new google.maps.Map(
document.getElementById("map_canvas"), {
center: new google.maps.LatLng(37.4419, -122.1419),
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var kmlLayer = new google.maps.KmlLayer({
url: "http://www.google.com/maps/d/kml?&mid=1JwCy1i6rn9ailO2MPxPj-XxX0EY&lid=z3MgxTVp8WWA.kUnMLigc_WOw",
map: map
});
google.maps.event.addListener(kmlLayer, 'status_changed', function() {
document.getElementById('status').innerHTML = kmlLayer.getStatus();
})
}
google.maps.event.addDomListener(window, "load", initialize);
html,
body,
#map_canvas {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="status"></div>
<div id="map_canvas"></div>
Seems like an issue in Google's KML renderer. If I download your KML and render it with the third party library geoxml3 (disclaimer, I currently maintain that library), it displays OK.
redered with geoxml3 (but there is a performance hit due to the native rendering/lack of tile based rendering).
Note that I couldn't use the KMZ file directly, there seem to be character encoding issues with the zipped KML when rendered by geoxml3.