First bug: after putting things into a chest which is on the ground but not nailed, it appeared to multiply the chest. It still acts as one chest when I right-click it to open, i.e. there isn't a list of chests to select from to interact with. When I try to pick it up, it brings up a quantity selection bar, and when I select the maximum, it actually picks up about half. The others remain where they were, and are no longer interactable. The inert half disappears on relog, but the duplicates in the main stack do not. The apparent quantity of chests has increased as I've put more things into the chest.
Second bug: having filled all the slots of the chest (not all to maximum value, just there's a stack in each slot), I tried to take one of the stacks out. It appears that it did put the items into my inventory, but they remain in the chest as well. These quantities in both locations appear to persist through relog, though it's possible they'll reset on server restart. This behavior does not seem to be consistent from slot to slot: the duplicating slot was the bottom row, third column. I tried removing something from the top-left slot and it removed correctly. Having done that, the stack that had initially been in the duplicating slot moved over and I was able to remove it correctly as well. Might just be that A3 slot that's affected?