When you place a furnace adjustment to the wall (tested on T1), it is possible to place it in such a way, that a small part of furnace sticks out of the wall on the other side. And then it is possible for the other person to get the content out of the furnace (through the wall).
I can confirm this - we were just robbed of all the items inside, on PvE server (doable through window too).
The easiest solution: let us LOCK all crafting stations! Why is there “OPEN” status if we cannot change it to “LOCKED” as with containers (chests)?
just for information, 10 month ago it was possible to lock workbench. Problem was, when you was raided, all workbenchs were destroyed so you have to start from scratch. Now that worbench are open, when you are raided, if a chest is not close from the workbench, you can hope to still have your workbench. Matter of choice, either you stop to build with windows, eitheir you ask to have worbench locked and have them destroyed when you are raided. your choice.
They do need to stop it from happening though. Clearly the boundaries of the model are smaller than the selectable area of the model. Probably the same issue which allows the rhinos to pop their head through a wall and hit you. Simply shouldn’t happen.