Spy in CIG

I've got some decently well developed spies in my current campaign (as a result of the rather broken AI agent spam), what I've encountered tonight though has me puzzled, I've run into a couple Nervi Generals who when you select them to assassinate show zero chance of success for all three methods.

So, ok, one of these is a four star spy, fair enough, perhaps he's got nothing developed in that area when I flipped him.

But, I've also got an 8 star spy who encountered 6 star Nervi General and this spy has indeed been buffed on assassination skills repeatedly, yet he also has zero chance across the board of killing this General.

WTF is going on here? To me, this looks broken. Anyone else run into unkillable Generals?

Are you perhaps referring to those special generals like Caesar and Vercingetorix?

I'll have to check, I know it's not Caesar since I'm playing Rome in this one.

Surely the Nervi do not have multiple unkillable generals do you think?

I don't own CIG but I remember this from translating the leaked information from Russian and then also reading the official release info. Every CIG faction has at least one special general with unique skills and a unique model. Nowhere was it mentioned that they would be impossible to assassinate but it does make sense. Getting Caesar killed by a Warmaiden may be funny but it would ruin the whole point of this DLC - to conquer Gaul as Caesar (or vice-a-versa).

If this happens to every single general you run across, then it is a bug I suppose. Are you using some mods?

No, no mods, I don't tend to use them on R2 and S2.

I'll keep an eye out as the campaign progresses, see if I continue to run into it.

The zero percent chance just struck me as odd. I agree it would be silly to be able to kill Caesar, but it's still odd two different Nervi Generals are effectively unkillable by a spy.

I need to get a champion near one of them and have a go with him too.