Upon opening any form of chest (normal chest, double chest, trapped chest, ender chest), the normal opening sound effect is played. However when the chest is closed, the opening and closing sounds are played at the same time.
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Duplicate of MC-35714 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.