I had it in three different games now, that I can plant barley, wheat, flax ect. with no problem, they grow during summer, but in each game one of them was never been harvested. I manually selected a villager to harvest, and it always tells me, I can only harvest it in spring (when they plant it). So far it has only happened to me in WorkShop Maps (Flatlands e.g.) but since it happened in different ones maybe its a broader issue.