I don't know if it's a bug or not. I've played a few games in 1.4 and towards the end of a run if I don't play something for a while it seems they go into a repetitive task no matter what. The most common one is that when food is low they keep harvesting toxic berries, which obviously are not food... or they keep harvesting seaweed

I've had the same problem. Only if harvesting herbs then toxic berries was the priority. But at the same time they should pick up an axe lying on the ground and start chopping trees for food and wood, and harvesting more filling food first then herbs then toxic berries. 

Yeah i agree on the poison berries! I understand the problem and am trying to fix it!