A questions on the MedMod (probably has been asked before, but please do not slap me)

I usually prefer to play GA, and for some factions I get a CTD as soon as I click on the GA button.

This seems to happen with new factions, such as sweden or the Swiss - is this caused by the fact that GAs are hardcoded and it therefore does not make any sense that I try playing the added factions in a GA campaign?

Thanks in advance for clarification