If you have a furnace/smoker with items smelted in it inside the nomadic book area, the exp will be dropped when the area is "put away".
When the area is deployed again, the items are still in the furnace.
If you "put away" the area again, more exp will drop.
This can be done over and over to get infinite exp.

Nevermind. Just say a more recent version has a fix for this.
Sorry for bothering you.