I think it crushes at the beginning of your turn (which is after the eleutheroi), so it could be linked to your new bodyguards (pahlava gets new bg, right?). I do not have any clue to solve your problem, to be honest, and due to all the changes with your minimods it might be very difficult to find the bug here.
concerning governements:
the script spawns new gov's for the AI, is it only the Romans who are stuck with that or all factions?
concerning pahlava reform:
I do not know much about them, but if also the saka reforms did not happen (and this reform is such easy), I would guess you have some missing/corrupt reform triggers in your game
In that case IMHO your game is lost and the better way is to reinstall.
I'll have to ask it:
XSamatan
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