Details: I had 11 diamonds, and other items in a chest, the chest was full, i saved and quit the game and not even 10 minutes later logged back on, my chest had 13 lapis and 67 redstone and some cobble, i picked it all up and logged out and back in, and the contents duped back into the chest and into my inventory so i now had 26 lapis and 134 redstone.
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Version 1.4.2
Details: I had 11 diamonds, and other items in a chest, the chest was full, i saved and quit the game and not even 10 minutes later logged back on, my chest had 13 lapis and 67 redstone and some cobble, i picked it all up and logged out and back in, and the contents duped back into the chest and into my inventory so i now had 26 lapis and 134 redstone.