OK so I did a quick test about this in contracts and it looks like the bug affects all the cloaked guard enforcers, or at least the three I know of: the patrolling guard I mentioned (he’s actually the AR and not the shotgun one), the one at the top of the castle, and the one near the Constant’s desk in his tower. Each time I walked up to them in a cloaked guard disguise (since they’re enforcers for that) and they started shooting without warning.
So it’s probably fair to assume it’s the same thing in Freelancer 