I have downloaded the entire Germany map files on a second device - same problem (I started the time-consuming download prior to reporting the problem and therefore did not Interrupt the second download).

I also downloaded the Netherland map files and initially encoutered the some problem as above. However, after unsubscribing Germany, everything was fine (Germany left as a white spot, however)..

Therefore, there might be a problem with the Germany map files on the server.