While resolving the Early Jan '15 turn, I saw a Japanese supply wagon appear outside Berlin. My initial thought was "graphics error", but while reading the turn log, I was surprised to see one of my empty ammunition trains had been attacked as it passed through, and the area around Berlin was now pillaged. That Japanese supply wagon had really teleported to Berlin and caused damage.
I then peeked at the Western Ententes file and found this line "Japanese Units have been relocated to Japan. (Note: Japanese units may only operate in the Pacific Off-Map areas". So, the game did recognize this bug and corrected it.
Has this happened to anyone else?