I tried making a villager breeder in release 1.14.3 and the villagers were both in the same spot, constantly picking up and dropping their food I gave them each, and they do not breed at all and they do this all day. Villagers have no profession.
Environment
Minecraft Java Edition release 1.14.3 Windows 10, Java 8, Vanilla, tested on multiplayer and singleplayer
Duplicate of MC-154031