When I clone an interactive block for example a chest or a dropper and this block happened to be named one cloning this block the contents and the block clone but the noticeable difference is the name doesn't clone, now this was working in 1.2.2 but doesn't seem to be working now. Yet, the name when cloned says "Dropper" but when you do the '/testforblocks' command and try to compare it to an other dropper named 'Dropper' it doesn't work and fails to match the blocks it seems as almost the Dropper has an NBT that has changed in it on cloning it.

The images are examples of the before and after cloning the block.

Hope this is fixed soon!