What I expected to happen was...:
to be able to replant my wheat after harvesting

What actually happened was...:
I cannot replant my wheat after harvesting

Steps to Reproduce:
I have a 9 x 9 plot of farmland with a block of water in the center surrounded by cobblestone except for a gate. once I put a villager in the farm, most of the wheat immediately broke in an apparently random fashion leaving farmland blocks that could not be replanted.