This station has got a very special configuration (Standortbescheinigungs-Nr.: 311351):
There are three sectors with GSM and UMTS (higher power on sector C). LTE1800 is only active on sector C (in order to support the Heiligengeistfeld/Millerntorstadion area), which makes the LTE1800 footprint on the map a bit misleading because there are no other sectors that you are handed over to while walking around the transmitter.
/Edit, 21.12.2022: LTE 1800+2100+2600 with 4x4 MIMO.