I'm not sure how far this goes because i just started playing the game...when i was doing the first intro tasks...i made a bed roll, put it down then another was in my hand waiting to be put down as well. ended up with two. when i was building my base, put the bedroll down and another was waiting to be put down. Same thing with the campfire. I made one wooden block, put it down and still had one in my hand as well. they just kept staying in my hand, i could have build an entire base with one block. So anything that is a block, and you put down kept duplicating in my hand and i could have an infinite amount.
I included my YouTube video link so you can see exactly what i'm talking about.