I went exploring new territory to find potatoes and carrots the first time I ran 1.4.2. I carried an Ender chest with me to double the amount of items I could find and bring back to my base. When my inventory was full, I moved items to the previously-empty Ender chest.
Later, I found that carrots, potatoes, and boats (at least) that I had found in my exploring were gone. They weren't in either the Ender chest or my inventory. I didn't die while exploring, though I did fill my inventory a few times. Each time, I placed the Ender chest and moved items to it. It was only after a few hours when I was finishing for the night that I found my carrots, potatoes, and boats were gone. Other items may also have gone missing, but those were the ones I was aware of.