Drag and Drop issues in Kontact

If I read the documentation correctly, dragging a contact from KAddressBook onto the Tasks icon will create a task with that contact. Similarly, dragging it onto the Calendar will create an event with this contact. I can’t make it work. The cursor changes to something that looks like it will accept the drop target, but no event or task gets created.

Dragging an email onto these icons works fine, however.

Am I missing something, or is this something that’s to be fixed?