When the new Zygarde item the Reassembly Unit is placed down right clicking it will activate the machine. However when left clicked, even once it will be destroyed like a flower would. It doesn't drop, it is just destroyed. There is no mining animation, not a held down thing but a one accidentally click and it's gone and you need to craft a new one. Another thing is I play on a multiplayer server where you can claim land and not trust others, meaning they cannot touch your items. However even someone visiting can left click the machine and destroy it leading to some problems considering Ultra Deep Sea Crystals are a little rare. Thank you.