The bug
When a sulfur cube absorbs a block, the front of the block is shown at the front of the sulfur cube’s face. This is most easily observed with carved pumpkins. According to MC-307654, this is incorrect.
How to reproduce
Spawn a sulfur cube
Feed it a carved pumpkin
Expected result
Should have the pumpkin face behind the sulfur cube
Observed result
The pumpkin face is in front of the sulfur cube
Likely intentional, as the sulfur cube renders the block’s item model instead of the block model like on java,