Dragon Egg underneath texture not appearing

The texture for the underneath of the Dragon Egg block is not appearing. This occurs in both The End and the Overworld, with both the naturally-spawned egg and eggs that have been spawned using the /give command. It also occurs only when the egg is placed on solid blocks.

What I expected to happen was...:
Texture to appear as normal

What actually happened was...:
The egg was lacking texture on its underside, showing through whatever is behind it.

Steps to Reproduce:
Place a Dragon Egg on a solid block and inspect it from beneath, or inspect the egg that appears on the portal when the Enderdragon is defeated.