@MojangSupport The update deleted half of my world’s progress, how do you plan to fix this?pic.twitter.com/X1xDwbBt5L
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If you think you've found a bug, please visit https://bugs.mojang.com/secure/Dashboard.jspa … and report it so that the developers can see. ^RL
“If you think you’ve found a bug”, I think getting half my world deleted is perfectly normal 
@MojangSupport No answer yet.
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