Hi maxand,
Just after you reach the waypoint with the large buoy in the center, you should be teleported back to R’dam. If, instead, you followed the green tick on the chart SE and got the globe, you missed a hidden EX waypoint.
The mission can’t complete if you have not hit every EX waypoint.
There are two of them in that mission:
The first is a jump to the North Sea. It is just past the first waypoint in R’dam. You should go through the right half of the visible waypoint in order to hit it.
The second is just beyond the visible waypoint with the large buoy. You must continue through the visible waypoint.
After you tie up to the two bollards, the final taxi waypoint should complete. You must tie up to the particular bollard that the mooring waypoint is built upon, even though all bollards in the area are lit.
In this case, it is the bollard at the center of the green circle.
Regards,
Marty