Cannot trade with villagers

I understand that you are not supposed to trade with villagers during a raid, but now I cannot trade with ANY villagers. Raid or not. There was no raid in that world. It is impossible for there to have been. It was just a The Void super flat preset with an iron floating building. No raid, no bad omen, but still the villagers would not trade. They were not green villagers, so something fishy is going on. The picture below is all the blocks in my world