A small flaw in mission design/ship specs in the 2nd mission of Chapter 4. As it can be spoiler, I post it in dark blue:
In this mission you fly the GTF Daedelus for the very first time, (IIRC). In briefing you are told that it is a stealth fighter, but it actually has no stealth abilities at all. I thought it was an FS2 bug so I studied the ship definition table, and I checked that it has neither the stealth flag nor the $Stealth command. Moreover, in the ship '+Tech description', you are told that it ISN'T a stealth fighter indeed, it is just a bad try. So ship specs would be right.
The problem is that in game you are told it is stealth and you aren't given any info about its cloaking flaw (either within mission or in debriefing). So it can puzzle the user how shivans engage him, even launching homing missiles.
At least that was what happened to me. I thought: "Aha... here I have a FS2 bug."
I think that an small mission redesign, adding some additional chat about not having cloak and a comment about it in debriefing would be great.