This has been happening to me for quite a while now quite often
it may be linked to something I have been seeing where after super FFWDing through sleep the character is hungry and thirsty, they then eat a trencher, becoming stuffed, and then they drink 2 or 3 water which pushes them up into Sick: overeating. I have Super FFWD from that point and died before as well
I have included a save file, if you super FFWD from there a couple hours my character should die. I did it once with a 6 hour FFWD and once with a couple 1 hour FFWDs
Playtime: 4d 6h 32m 29s
Mods: no
Version: 0.15.0.11
repeatable: yes