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.