Bug/Issue Minor: "Phantom" barrels on infested mine level

I was in the cold part of the mines, level 64 to be exact, and this level happened to be overrun with slimes. When I fought some in one of the rooms with wood floors where barrels would normally by, an animation of wood splinters played, as if I broke them... even though none were there.

No items dropped, nor was there any sound. Just the animation.