Question about Lenovo 40AC0135CH ThinkPad Thunderbolt 3 Dock

I can charge a 70W Fujitsu just fine. The dock has 120W. It doesn't have any other large consumers.

I am using a Yoga C930 with this power supply unit. The power supply from the dock has 135W, which is certainly sufficient for a notebook. Note: The docking station has a USB-C connection at the front and at the back. The charging power of the front connection seems to be reduced, because it is not sufficient to charge the notebook in operation. With the rear connection, however, it works without any problems.