While I was messing with new villages and villagers in the latest 1.14 snapshot (19w13a), I encountered a crash while observing the villagers having a town meeting. Every time it has crashed, the villagers have also been creating love hearts. I don't know if the villager breeding is directly related to the crash, or if it is a coincidence. The crash report did say that it was because of a ticking entity and that it was a villager, so I do know that much.

I attached the latest crash report if it is of any help.