Nether Gold ore has default stone breaking sound instead of the new Netherrack breaking sound.

Description:

Reproducible in all snapshots containing nether gold ore. When the player walks on top of or breaks the new nether gold ore block, the default stone sounds are played, instead of the netherrack sounds that were introduced in the first nether snapshot.

Steps to Reproduce: 

1). Access your creative inventory and find the Nether Gold Ore block, or simply go to the nether and find one.

2). Tread on or break the block.

3). Listen to the played sound.