Shading rendering incorectly when a mob is holding an item

[joker876]

I found a rather serious bug, causing the image to be rendered with same shading on all 3 visible sides when the mob (not player) is holding any item in its hand. However, if a mob is wearing a player head, the head is shaded correctly, and the rest of the armor isn't. The mob itself is rendered correctly, only the armor isn't.

We would be very grateful if you fixed this issue.

Here are some images generated using wikitools:

[joker876]

hello?