I can confirm this bug. Infection of torso: Immunity at 90%, infection at 87%. No other infections or bleeding, she just finished eating at the table then went back to bed. Got a notification that it turned extreme, then a couple seconds later that she died. As you can see, no malnutrition in this case. I've had this happen a couple times before in other runs but never got a screenshot. This is on version 1.0.1943.
https://i.imgur.com/uBIVLpf.jpg
https://i.imgur.com/uBIVLpf.jpg