Odd texture of falling gravel entities

The texture for Falling Gravel appears as a brownish block.

What I expected to happen was...:
When the gravel fell, the entity would maintain the regular gravel texture.

What actually happened was...:
The affected gravel disappeared for a couple frames, and was replaced by the texture seen attached. The regular gravel texture returned once it hit the ground.

Steps to reproduce:
1. Load a Customized world under the preset Good Luck
2. Find a cave with a gravel roof
3. Punch a gravel block to set a chain reaction.