When attempting to breed villagers standing on a fencepost, they will just stare at each other and not breed.
Expected Result: The villagers will breed while on a fencepost, just like in previous versions.
Actual Result: The villagers just stare at each other.
How to Reproduce: 1. Build the villager breeder featured in this tutorial: https://youtu.be/9u0XTI83Zec.
2. Feed the villagers carrots.
3. Let them sleep for one night.
4. Wait some time for them to breed.
5. Try in 1.15, it should start working immediately.
This bug makes it quite challenging for anyone who is at the beginning of their survival experience because obtaining high amounts of villagers is extremely important in the early game.