Navigation does not bypass long traffic jams despite TMC Pro and display of traffic jams in the display

Hello, yesterday I was on the highway. The navigation (current comand with TMC Pro) showed a traffic jam on the way back in the display about 20 km long (red car symbols on the right side of the route). The reason was a construction site (which I already saw on the way up). Nevertheless, it piloted me directly into the beginning of the traffic jam. At that time I just drove a intermediate piece on a federal road and then didn’t do so. Navigation on the highway (where the traffic jam was already back to the driveway), but drove the almost parallel and completely free federal road for approx. 25-30 km further and chose in the comand the menu item “Stau ahead” and then after the indicated end of the traffic jam (construction site) to switch back to the then completely free highway there. Since the reason for the traffic jam, as said, was a construction site, it can hardly be that the traffic jam was present 20 km before the construction site and then did not continue to the construction site. What I ask myself: Why did the comand directly put me into the traffic jam?”