I had the same issue. Do you have the Ultra HD UI Assets turned on? I had that setting turned on and couldn’t see any groups so I turned it off, restarted the game and I could see the groups again.
Unfortunately this didn’t work when I loaded into a savegame, so I had to restart my single player mission from scratch. Haven’t tested in multiplayer yet.
The problem is with large minimap. If you finish a game with the large minimap On the groups will disappear. All you need to do is start a game put normal minimap size and quit for restore the groups. Is quite annoying and i Hope the devs will figure out soon.