It's an OLD bug but I want to report it.

All the core animations of Minecraft are badly rendered in the "terrain.png" spritesheet of HD texturepacks.
(HD = above default resolution of 16x16)

Instead of beeing rendered in their correct HD slot coordinates in "terrain.png", they are still rendered in their SD slot coordinates leading to display the animations inside some other blocks.

Those core animations should be rendered in the correct slot of HD texturepacks (it will prevent the display of core animations inside other blocks).

I know, MCPatcher and Optifine are doing this very well but, it should be Minecraft which should have a "basic" support for HD texturepacks (MCPatcher and Optifine will still have a lot of benefits like custom animations).