Well, two things that are common for both cases is that I played at min speed, and also was messing up with Mira to make sure she doesn't interfere, ie prevented her from attacking heroes by capturing territory around her.

output_log.txt

I started the map again. For some time everything was fine. But at some point workers kinda forgot how to imprison heroes. They try to grab heroes in order to drag to prison, but then release them immediately, and continue to do so until heroes die. I have more than enough space in prisons, and even didn't used saves during the map.

Tested it a bit more. I can release heroes I currently have in my prison, beat them again, and they will be dragged to prison again. But all freshly beaten ones will be ignored by imps.

Cultists do the same thing, but their resting pose, when they are kneeling and praying, suits healing much more.

Yup, forgot about blood money :)

Still, I don't see a reason to limit overlord's freedom in this case.

Yeah, turns out you can't drop creatures inside if it already has more than 1/2 of its capability. It seems a little too strict, if I want to quickly free some space in prison with no access to graveyard, tavern probably is the best way.

I can test it more a bit later, for now I can tell that it was approximately at 2/3 of its capability when I tried to do it. Clearly not full.

In the campaign torture room unlocks much sooner that spirit chamber.

So you can make dozens of spirits, possibly hurting fps, with no way to get rid of them other than restart the map.

No really a bug, but a flaw in design.

No, it's not true. I created a new bug report for this.