When I attack a drake and his two pack drake companions, as soon as its the pack drakes turn, nothing happens. The drakes never take an action and the combat stalls. The only option is to auto complete the combat. Happens every time I've reloaded the saved game and played out the combat.
Here is the saved game:
https://www.dropbox.com/s/z6zibepnfz7cfmf/testing.EleSav
Just attack the drakes with my sov's adjacent army.