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.
Can confirm that the opening sound is played again when closing the chest (ca. 1 out of 5 closings)