Start/Finish Date Summary Values for Duration in Primavera Cloud

In P6, when you had a series of Milestones under a WBS, the summary bar Duration field would be a production of the latest date minus the earliest date.

Now in OPC the Milestones behave different as they only record in the status tab either a Start Date or a Finish Date depending on the milestone type. Since one field is left missing, the summary does not have two numbers to calculate Duration by.

Therefore, is this a glitch? In any Schedule Report you would want all your WBS bands to roll up in the same manner. It works in P6, It should work here being that the intent was to replicate or improve features in P6. This one seems easy, just populate both fields when using a milestone like it does in P6.