Falling Gravel/Sand Glitch

When you place sand/gravel on a high place and let it fall, the lighting and texture of the block will change during its fall.

Expectation:
For the block to look the same during its fall.

What happened:
The texture and lighting of the block changed during the fall.

How To:
Place sand/gravel on a high place and let it fall. During its fall, look carefully at the block.