If you walk towards a chest and jump just as you are about to hit it, there is a slight chance that you clip straight through the chest and find yourself inside it. You can then jump to enter nearby chests. The attached video describes the glitch better than I can, so I suggest watching it.
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kumasasa
Duplicate of MC-1635 , please use the search function to see if your bug has already been submitted. Currently over 45% of tickets are being closed as duplicate.
kumasasa
Please do not mark issues as private, unless your bug report is a security issue containing information that may compromise your server/client.