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In attachment two save files that display the errors.
In the first you can see imps running in circles while trying to drag slain enemies to a pyre in a recently claimed crypt.
Selling and rebuilding the crypt fixes the problem.

In the second you can see the rest of the rooms in the recently taken over enemy dungeon not working. 

The training room and the forge has creatures running in circles but not gaining experience or producing things, the tavern doesn't get stocked with piglets (though this can be done manually), and the captured enemies in the torture chamber don't get tortured.
Note that all these rooms do work properly in my own dungeon in the south of the map.

snowhope_20220223122732

snowhope_20220223124250

Thanks for the feedback.
In other good news, I managed to get the achievement after a few more tries, so that problem was probably on my end.