As of the latest 1.7 pre-release when you open up Chests it plays the opening sound again as if you had opened it again.

What I expected was that the sound would only play once, yet it played again a short amount of time after the first sound was played.

To reproduce the error:

Try to open a chest then wait for the sound effect to play if done correctly it will play again shortly afterwards. Applies to all chest types.