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If you stack a grass block on top of a dirt block, or a dirt block on top of another dirt block, the texture doesn't transition properly. There are some strange kinks where shadows are suddenly cut off, or some of the shapes are misaligned, or the edge of one shape will suddenly become thicker.
*Edit: Ah, maybe I should mention that I'm using the 128x version for 1.6.2 with Optifine
**Edit: The same is also true with the top-down view on dirt blocks placed adjacent to each other. The East-West edges.