Gmap autozoom when using a kml file only

Hi everybody

when using a macro like [gmap overlay=kml:https://www.server.net/somefile.kml | behavior=+autozoom +notype]

expected behaviour: to see the map with the overlay and zoomed in so the full overlay be seen.

what happens instead: whatever the standard settings is shown on the map.

I would like to see a map the way its displayed on maps.google.com when parsing the url of some kml-file.
Can somebody tell me if I am doing something wrong?