When, as an army, attacking another army that's besieging a friendly town, in the resulting battle the AI won't realize it's actually a siege. The defenders spawn inside the walls and try to get out, the attackers just smush themselves into the gate. If you open the gate, it's like a normal battle with buggy pathfinding because the AI just gets stuck in walls, tents and barricades
Getting your companions a "job" such as surgeon etc. is severely bugged for me. I chose the autoskill option in the menu and even after several ingame weeks of being a surgeon, my surgeon was still skill level one - same for my quartermaster. It is currently better to do everything yourself.
The Army commander AI is sometimes extremely buggy. Yelling at me to defend and/or fallback if the enemy is close to routing while we're at almost full strength still
Enemy armies will very often have vast amounts of out-of-faction units. While that may happen, it's just unimmersive. Especially if all lords of said army are originally from that faction to begin with
The mercenary payout is severely undertuned. I was offered 30 gold per day as a mercenary, earning lots of influence. Only it never goes up properly, so it's completely meaningless (not that making money is hard in this game, mind you.
When defeating an enemy army, own-faction units (that were prisoners previously) now turn up as prisoners also, not as recruitable units.
Pathfinding on the campaign map is bugged. Caravans and Lords will frequently run through mountains or take a swim in the sea if it's a more efficient path.
Archers sometimes won't shoot at enemies in circle formation
When, as an army, attacking another army that's besieging a friendly town, in the resulting battle the AI won't realize it's actually a siege. The defenders spawn inside the walls and try to get out, the attackers just smush themselves into the gate. If you open the gate, it's like a normal...