I think it was supposed to be like that. The cook didn’t touch crops until this version from 14 days ago.
The notes just say “Cooks should farm”. I think you are still supposed to have farmers to plant crops, but they added something for the cook to do while he is not “crafting”, like other classes (carpenter, mason etc.) are building for example. So if you have 2 farmers and promote one to cook, your food system doesn’t collapse, as the cook will still do some work of cleaning the fields to let the lone farmer replant new crops.