When opening a double chest for the first time, the opening-chest sound is doubled with a slight delay. The issue only appears during the first time the double chest is opened and applies every time the game is loaded or a double chest is initially created - on leaving and then entering a world, the issue persists. This bug does not happen with a single chest.
This happens in both creative and survival.
Linked issues
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Thank you for your report!
We're actually already tracking this issue at MCPE-95547, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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that happens to me too over on Minecraft pocket edition