Course structure not updated after new units are added

I am not sure if this is intended or a bug, but when I have choosen in the course settings for the course structure to be displayed in the course details page, this information is not updated after I add new units and publish them. I have to go to the course settings again and on step 2 to hit the update button.
Is this how it is intended to work?
Seems to me that it would be much better if it automatically updates when we add new units.
By the way this is also the case when I add new elements in a unit, the time in minutes that is displayed is also not updated automatically.