Oh man, i’m Afraid it’s your well known part of the story...those upgrade files and flotillas assignations...
...Propbeanie is our Dönitz here in OM!
Seems Lurker gave the Black Sea flotillas a type XXIII? ... from Wikipedia it was probably a German thought, but never happened.
That makes me think type XXIII is the only one i didn’t re-work...and will not be, because there isn’t any other better model elsewhere.
So best is to avoid this one for the moment.