Leaves Not Rendering Right

In Minecraft 1.8-pre1 and some other snapshots, leaves are not rendering right. All Leaves Have No Transparency, they just come up with black pixels. I don't know if this is intended, but it doesnt look like it. The picture included shows all leaves in minecraft 1.8-pre1. In the inventory, they do have transparency, but when placed they don't have transparency. PLEASE FIX