duplication issues
MC-63Player data and region files not written/saved to disk simultaneously, causing item loss/duplication
Normal
MC-151Pushing TNT with a Piston and activating it at the same time duplicates it
Fixed
MC-341Duplication and deletion of hotbar items in Creative using number keys
Fixed
MC-647Tnt sometimes makes item drops when it is ignited by the explosion of another Tnt
Fixed
MC-697Default singleplayer player data is always used for players opening world
Normal
MC-1619Infinite rail duplication glitch
Fixed
MC-1860block and item duplication
Fixed
MC-2039Sand, gravel, and Dragon Egg duplication still possible in 1.4.3 prerelease
Duplicate
MCPE-841Duplicated stone brick in creative inventory
Duplicate
MC-3960After the last use of a bow you get a glitch bow that when dropped and picked up again duplicates
Fixed
MC-5405Duplication of Items/xp in game
Invalid
MC-5415Creative Mode Item Duplication into hotbar
Fixed