Adding MapException to a Delegate, ScriptTask, UserTask element

I’m trying to add **MapExceptionEntry** to my tasks and delegates when I’m trying to publish the application. The log shows that the task contains the entry but after publishing the application the bpmn 2.0 xml does not contain the required tags(**flowable:mapException**) in the **extentionElements** tag. The version we use is 6.1.2.