When I activate the Oraculum, three specific unconscious witches instantly die. How do I avoid this?

In The Royal Conservatory, the following happens after I've rendered everyone in the building unconscious:
(a) I check my Stats for the Current Mission and they say:
Spotted by Enemies .... 0
Assassinations ........ 0
Nonlethal Takedowns ... 27
Total Kills ........... 0
(b) I place the target in the Oraculum and turn it on.
(c) I check my Stats for the Current Mission and they say:
Spotted by Enemies .... 0
Assassinations ........ 0
Nonlethal Takedowns ... 27
Total Kills ........... 3
I have identified the three unconscious witches who die:
- the one with the gray vest and white shirt in the turtle courtyard
- the two waiting to ambush you in the alley to the right of the first Wall of Light on the level
No matter what I do with these three unconscious enemies -- whether I move them to another spot, swap them with other witches's unconscious bodies, etc. -- they die as soon as the Oraculum is activated. I even tried carrying one of them over my shoulder while turning on the Oraculum, but of course the game makes you put down the body when you flip the switch. Then you get to watch helplessly as she bleeds to death.
Is there anything that can be done to avoid this, aside from writing to Arkane Studios and asking them to patch the game?
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How do you activate the Oraculum?
The faulty lenses can be used to eliminate Breanna non-lethally by taking her powers from her. In order to do so, the lenses must be found and inserted to the Oraculum, which must then be activated by pulling the lever.How do you knock out Breanna?
Down on the floor, there's the machine that can take Breanna's power. Go down there and use it (watch out for the witch patrolling the room). As soon as the machine charges, use it again to disjoint Breanna from the void, thus eliminating her without bloodshed.How do you deal with witches in Dishonored 2?
You have to crush the gravehound skull to get it to stop attacking you. Incendiary bolts work on the vines. I like posessing them, walking them into a corner and then choking them out while they are disoriented. When you posess them, they know you are there and will make comments about it.How many witches are in the Royal Conservatory?
Rune #5 - Check out the other door to come out onto a balcony overlooking the lobby entrance far below with the four witches.Dishonored 2 - The Royal Conservatory: Oraculum (1 Lense) Witches Flashback \
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