I dropped an item in creative mode, while I was using a resource pack, and I noticed how the shadows are not only under the dropped item, but they cover the block(s) that the dropped item is covering, in a grid-like pattern.
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I had the same glitch, I think its only when you have HD Textures.
But I was using a 16x16 texture pack. Dinnerbone said that you have to have a file called .mcmeta in the resource pack for the shadows to work correctly. It's in the pack, but it's still not working.