Why is my Villager Breeder not working. Minecraft 1.16.4

I created my own villager breeder. It runs on 1.16.4, and it ran perfectly. It produced about 9 villagers, then stopped. There are 4 beds that the villagers can see. I feed them tons of bread. I traded with them to raise my reputation. They aren’t making any heart particles either. Nothing happened between the production to now, except me trying to fix it. I don’t think that the other 2 open beds are claimed. They always sleep in their beds at night too.

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