I have created a mod for a schematic and been able to build it in server with the book/mod item, but I am only able to build it once. Have tried updating mob and leaving/reentering server, but can only build schematic once. If I create a new world I can then build the schematic again, but also only once in the new world as well. When I try to build schematic additional times in any world I receive an error message. Is this normal? Can a schematic only be built once in a world?!?