This is a well known bug, that exists on the game itself, so its not really a server bug, but I’d thought I’d share it here.
This basicly is a flying machine, alright, that duplicates TNT.
Indeed.
TNT is unplaceable for simple members like me, I found the sample TNT I am using here in a desert temple. It duplicates the lit TNT entity, and shoots it out. Go have a look: