I have the same problem. I play with the game option: No FOW in your territory set to On (default). The fow in the area corresponding to the zone of influence is not updated correctly.
A save file to show the problem is useless in this case, because when we load a save file the fow is updated correctly, it is only during the game that it does not work properly.
Retribution v3.96, standard races, all expansions and DLCs, no mods.