The bug that im reporting is that stuff are dissapearing from the bottom half of double chests You guys need to fix this asap please make it so that we get all out stuff back because I lost alot of important stuff.

Thank you for your report!
We're tracking this issue in MCPE-102970, so this ticket is being resolved and linked 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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As noted on the beta download page you should always keep a backup of your important worlds before playing on the beta.

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