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.
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I was able to recreate this bug too. I opened the chest 10 times and the sound was played again 5 times.
Can confirm that the opening sound is played again when closing the chest (ca. 1 out of 5 closings)