When using a texture pack with items that render at higher than 16x16, the game is unable to render the 3d versions of that item properly. Examples include fancy Item drops, items in a frame, or items in your hand in first person.
Steps to reproduce:
1. Open Stick.png
2. Change the Image size to 32x32 using photoshop or similar. Save.
3. Open minecraft punch down a tree, breaking the wood down into sticks.
4. Place the stick in your hotbar as your active item and close the inventory.
When testing with an unusually high-res texture, it seems almost like it it trying to reproduce a 3d version with only 16 pixels, but this is uncertain.
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is duplicated by 12
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6 more comments
and it's not texturepack specific, so you don't need to tell everyone it doesn't work on your favorite texturepack
Nathan Adams
Can confirm.