In the mission that I've made it uses the Show/hide module for the opfor, it seems to work fine in SP. The enemy will be hidden until triggered, the enemy will attack but if the player enters a vehicle your squad AI breaks and doesn't attack the show/hide enemy anymore.
If you start the mission on foot and don't enter any vehicles, your squad AI will shoot the hide/show opfor and everything works perfectly. If you attempt to switch to another team mate, for each team mate you switch to they will NOT shoot back the show/hide opfor anymore. If you use the hide/show module in MP it will hide the enemy for the host but not for other players, other players will see the enemy clear as day, that's a serious flaw in MP and regular SP AI.
The hide/show module activated by a trigger is a wonderful way to create easy spawns in custom missions, and an easy way to create an ambush. What needs to be fixed is the module needs to work in MP and SP while not breaking the squad AI. {F26819}