I noticed the same issue with 1.01 RC2 : in grand campagin, on turn 1, the siberian IA ALWAYS make an attacj with Syrovy's Legion against Bugulma with forces that can't take the city. Result is usualy a red victory with a moral variation.
I made 10 tries in a row, each time the Siberian laucnhes this attack (other attacks are not systematic) (enclosed screenshot for the engaged forces, they are ALWAYS the same).