Two bugs: 1. The ProdigyGadget book spawns in my last hotbar slot but deletes the item in that slot (I didn't have a lot of inventory space left but there was some). 2. The ProdigyGadget book keeps spawning after every logon. I'd expect it only to spawn when I first joined the (survival) server instead. Fixing this would fix the first bug however it I think it also might delete the leather boots of newly spawn players.