Description: When spawning gnomes by using a gnome hat on a gnome statue, only the first gnome appears and this error: "java.lang.IllegalStateException: Entity is already tracked!" appears for each one after. If I break the statue after attempting to spawn the gnomes, the hat items from the nonexistent gnomes get spawned above the statue, as if the extra gnomes were there the whole time. If I attempt to spawn the gnomes, then leave the world and rejoin, the gnomes that were not there before appear. After I have rejoined the world, this bug does not occur again.

Steps to reproduce:

Load up the game and enter a world.
Place a statue block down and right click it five times with gnome hats.

Actual Result: The first gnome appears but the ones after do not.

Expected Result: All five gnomes appear and are able to walk around.