The problem is that if the faction it is going to doesn't have anything to recruit, then it crashes. So if the city is going to the founding faction, it will crash if there is no units for it to recruit.

And then if you put a unit that is only recruitable for the "slave" faction(ownership=slave, recruitment=all), and it revolts to a faction, it will have that slave faction only unit. And trying to fight that unit in a battle will cause a CTD since the faction isn't suppost to have that unit. I tried this on my own build but it was only a half fix.

I also thought of making some kind of AOR system for the palace building recruitment, but the couple of times I have tried to figure out the EBAOR, I have just gotten a headache and given up. (I could copy the levy units in the first level of local MICs, but then there would still be the gaps.)