Commander: Europe at War, again

A few days ago I restarted another campaign game on Commander:Europe at War, again playing as the allies and starting from 1939. As the Allied units were being pushed back in France, I decided to do a Dunkirk evacuation and move the UK and French forces to the safety of Britain, leaving a single rearguard unit. However, after France had officially surrendered in the game, the evacuated French forces disappeared from the the UK map, even though they had safely arrived there.  Meaning that my evacuation had been ignored.  This is either a bug or something the game's designer's had ignored when they were doing the background research.