Found a couple of bugs, I think.
I cast the Mutation spell on a slave with the "Natural Beauty" trait. Her beauty went down to 15, despite its min value should have been at least 10+35=45:
10: min beautybase from the Mutation spell
35: trait effect
I guess a similar bug happens with Scarred and Blemished slaves.
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Emily left home together with Tisha. She used to sleep in a personal room.
She came back a week later and she got her room back, despite there were no free personal rooms at that moment:
You have 6/5 personal rooms available for living
I suspect the same happens when Cali comes back from her parental home. In that case too, she is only apparently removed from the slave list.
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Tia had Agility=1. in order to let her equip a long sword (this weapon requires AGI>=2), I gave her an enchanted armor (AGI +1).
Then I took the armor back: despite the AGI didn't meet the requirements anymore, Tia could still fight with the long sword.
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Partially related to the previous bug: enchanted armors/items let me fulfill custom requests when the slave stats are too low.