Minecraft Villager proliferate 1.13?

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As the title implies, I want to multiply 2 villagers. The whole thing happens in the Minecraft version 1.13! In the official Minecraft wiki I can only find information about it in the latest version (1.14).

Sure, some will now think that I'm just doing it wrong and it's basically pretty simple. Well, I've really tried every possible way now. In my village are felt 200 doors, which all have a floor and a roof. Both villagers are bought almost completely empty. Likewise, both were traded simultaneously, so that the corresponding effects arise. Both villagers show abundant heart particles over themselves. A thunderstorm, cloud, lightning or whatever will never be displayed. There are also beds in the village that are not used by any player or other villager. When dropping food, it will not be displayed by either villager. Whether bread, carrots, potatoes or beetroot. I stood over an hour in the area of the villagers and still no result.

I've already watched some videos, read the Minecraft wiki and asked friends. Every way I tried did not work. That's why I turn to you now. If anyone should know about the game, then write me!

Pa

That will not do