Block in Players hand renders buggy

If a Player holds a Block in his Hand it Renders inverted
(the Block looks hollow)

What i expected:
In former Times this Bug didn't exist,
and the block looked normal, like a 3 dimensional Cube.

This seems only to happen with Wool and Stained Clay Blocks

That's it, also thanks for the new Shading and Lighting System, keep the great work up .

orange greetings from

orangevanim