Huntress AI is bugged

I decided to study heroes and captured some lvl 10 heroes in the Home Realm. Some of them are huntresses. Their description says that they should work at arena or something like that.

But if they are not eating, sleeping or getting paid, they just standing in the middle of my tavern and constantly switching between "Idle" and "Work" tasks while doing nothing at all. It's not specified what kind of work, but I assume it has something to do with arena.

I do have an arena and some beasts, but huntresses acted just the same even when I didn't had an arena. It was like that before the last patch, and nothing has changed after it.

Only huntresses acts that way, so it's probably a bug in their AI.