May not be a bug if this was an intentional decision, but visually expected 3D renders of CC items (turtle, monitor, computer, etc.) in player inventory. Items appear correct when placed in world, and appear correct (if a bit larger than normal) in hand.

MC Version 1.94
CC Version 1.80pr0

The block model system changed for the better from 1.8.9 to 1.9.4, but it involves updating the individual model files to get the model rotations right (basically, display tags were changed, but models can now inherit them from other models better)

In general, you can just delete all the display tags on the itemblock models and add "parent": "block/block" to the block models.

Fixed in pr1