jamino is correct that the bug is not fixed for 1.0.7.0, but I imagine that it will be fixed in the future. I have no experience in programming whatsoever, so I can't really accuse Mojang of anything. The problem affects me as well. Do your items in your inventory clone themselves, but do not actually increase in amount? This takes up valuable space in my hotbar.
I just made a post to do with this exact issue, except you did I better job explaining
I've got the same problem, occurs on LAN multi-player with other people. Each player is hovering beside or above bed. Does not effect sleeping. Though is noticeable.
I have a similar issue, but it glitches on any world, soon after the game loads and occurs often, not always.
I suffer from the same issue, but also with the settings, save and quit, and resume button. Not that much of a serious bug, but still is present.
Same problem here. Brown clothed villagers, do not pick up beetroot or wheat seeds but do pick up wheat. This means that AFK wheat and beetroot farms don't work 😞
I don't know if I have the same problem, but my controls seem to get confused. I don't know if it is related to large worlds, but it only happens on creative. The jump button on the right disappears, and when I managed to fly, I fly downwards. This can be fixed if I tap below where the jump button was or the fly downwards button, a few times. It is rare, but still annoying.
Same problem here. Items clone in Creative and survival, but they do not duplicate. As in if 5 torches are cloned in 3 slots in the hotbar, you do not have 15 torches, rather 5. If the items are replaced, they are cloned also. The best way to fix is /clear or log off survival. Very annoying may I add.
Same problem for me. I went to the nether on LAN with all the players on the world. When we returned after 10 minutes, all the mobs in the world had despawned.
Sorry, I did search but did not find a post on this bug.