I'm trying to use a forestry multi-farm to automatically harvest Immersive Engineering hemp, but although it harvest's it, it doesn't re-plant it afterwards. This is a manual farm, and I remember reading something on the forestry forums that Industrial Hemp was supposed to be covered in a generic crop patch. I am underground, but I know that the hemp will grow. I didn't have to use bone meal to get the farm to harvest. Any clue as to what I am doing wrong?