Slitherine

I'm playing as Maurya in a PBEM and I absorbed my one province client-state Persia. 2 of her 3 armies became mine (although they still have their Persian green flag, they're mine to control), but the last one sits in their former province with their ruler as general and Persia is still existing. I doubt it is intended, although I couldn't find anything related to this in the manual. Persia was a glorious theocracy in golden age when I absorbed it.

Very weird. I never had such report in single player though. I wonder if you did not get an instant 'Persia reborn' event the same turn they were gone.

That may be although I didn't see such an event in notifications, and I'm pretty sure I did check with the different levels of notifications back then (I usually do before ending any turn, to get info on neighbouring nations)