An uncrewed dream fleet first becomes a logistics crisis

Which Second World War dream fleet appearing uncrewed but fully provisioned would cause the most problems for its navy?

The German or Japanese fleet, because either would overwhelm its navy's crewing and support capacity before becoming useful combat power.

A dream fleet appearing at anchor without crews would initially add an enormous support burden rather than usable combat strength. Germany and Japan would have to find trained personnel, maintenance capacity, dock space, and continuing supplies for ships their real fleets could not sustain. In Germany, the new hulls would also become priority targets for British bombers while still immobilized. If the Kriegsmarine assembled even skeleton crews for machinery, fire control, and main batteries, however, fully fueled capital ships could become an out-of-context threat to the Royal Navy. The counterfactual therefore turns on personnel and logistics before it reaches tactics.