OnLoad triggered twice when creating new entity. CRM 2015 online

From CRM 2011 and CRM 2013 I was used to get one onLoad Event when creating a new entity. In CRM 2015 (7.0.1.247) there are actually two onLoad Events. One when the new entity form gets opened and one when the first save gets triggered. This creates a problem when registering onChange-events in onLoad. They were registered twice and triggered twice after saving a new entity. Comparing to newest SDK this behaviour is not described or mentioned in any case. Has anybody recognized the same beaviour?