Ashadi

i can also confirm this for the 14w07a, just made a flat world, fill a cube of 10 x 10, turned it into a cheese from all the tunnels and holes i did for testing, mined blocks either close or away from my character teleported above the "ceiling" waiting on top of the cube, or 3 blocks away outside the cube on the ground(this is after mine the block and the item been on the ground without picking or interacting)
i usually saw this behavior on normal survival when the game "lags" can't keep up and waits from 1 to 5 seconds to pop the block from normal to been mined with incredible out of proportion arcs or teleports between the location it should have fallen initially and the location the lagged arc left it

i can confirm this, fresh started the game,decided to kill a 'harmless' zombie but had to go afk iRL(pressed Esc to pause), came back to game, dead automatically cause the game did not paused, just the screen

Same, doesn't work, any type of world, any seed, villages do not generate, even did a flat world with only dirt and villages allowed... empty... mobs, animals, grass,etc, everything except villages