I can confirm this as well. The hoppers do not consume items that are on top of it or on a slab that is over the hopper.
I have LG-D802. The game crash as is described here. But not only when the frame is on top of chest. It crashes also if the frame is inside a small house. If I try it on a simple wall, then it works correctly.
I can confirm this as well. The hoppers do not consume items that are on top of it or on a slab that is over the hopper.