2 different speed limits for one direction of travel

Tach Gemeinde, a question about the following situation: Construction site on a motorway. Speed limit in the construction site 80 km/h. At the end of the construction site the speed limit is completely lifted with a sign (sign is left and right of the direction of travel). 2 meters after the sign comes a “dynamic traffic control system” which indicates a speed limit of 120. What’s the point? Can the speed limits be so close to each other? Would I be happy if one of those really knows what could say about it. and “I believe” there was enough of friends and colleagues. 🙂 Greetings