I am seeing a (possibly) similar issue. Started up a new game and am running into large exposure deaths. I have a pop of 60, plenty of housing and firewood. Winter comes and villagers are out and about doing their thing. Then they start losing health and instead of heading into their homes they keep doing whatever they were doing until they die. Just lost 8 at the same time which is not great when you have an adult workforce of 30.
Please send this save to [email protected] so we can reproduce this.
Saves are located in:
C:\Users\YOUR USERNAME\Saved Games\Farthest Frontier\Save
Zip up the entire TownName_###### folder along with the .map file and .sav that reproduces the issue. If the files are too big, you can use a service such as Google Drive to share it with us.