So I just noticed this again in my world and it's really getting annoying because it's been going on since about 1.0.0 and it is items in chests, chest minecarts, dispensers and ender chests disappearing, I'm constantly losing Minecarts, Dirt and Cobblestone to it (this never bothered me) but it was just today that I got really annoyed by it when I lost just over half of a stack of diamonds, about 20 emeralds and a stack of iron blocks. I'm just hoping you fix this for the next patch. Other than that I'm loving 1.4.2 all the lag that I used to get is gone it's awesome.