Villagers

Villagers are significantly modified on Vanilla+.

Villagers on Vanilla+ are limited to 12 per chunk; any more than 12 in a chunk will despawn after a short period of time.

You can name your villagers "optimize" to disable their AI, meaning they will not move and therefore lessen the lag they add to the server. - This will not consume the nametag. Villagers that are named "optimize" still restock their trades.

If you wish to un-optimize your villagers, simply name them anything else. - This will not consume the nametag.

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Villager Breeders

Villager breeders are slightly modified on Vanilla+ due to the 12 villager per chunk limit, causing them to not be infinitely stack-able.

It is suggested to move your villagers a chunk away from where they were originally bred, as this sometimes causes issues with breeders breaking.

The borders of the farmland do not have to be glass panes, they can be any solid block.