When I play a custom faction with the warhorses trait, I have horses available, but not the warhorses. Sad, because the extra weight is the reason I picked the trait to begin with... but honestly not too bad a bug.
Tasseographer
Sometimes when attacking another square armies will become confused about which tile they're on, also-- it'll look like the army is standing on a tile they're just not on.
I've noticed other weirdness with Troll Armies not dying-- even in normal tactical battles. I'll watch them all fall over and when we return to the map, they army is still there... usually damaged, but alive. I'll kill them several times before they finally disappear for good. Is this some kind of regeneration bug? Reloading seems to make them die on their own.
I have the same question! I've facemurdered everything in the swamp (including Morion), and eliminated all of the deep pits. I've been wandering around it for several turns now, wondering what remains to be done there. There are still some troll huts, but I can't raze them because it's not my terrain, so I've just been repeatedly killing the trolls that spawn there. I even checked the other sides of the mountain ranges, but I've covered the enti