https://mojang.com/2014/05/minecraft-snapshot-14w20a/
Update: Snapshot 14w20b has been released to fix mobs not spawning naturally.
This weeks snapshot brings many bugfixing, a little polishing and possibly
even some hugs. Maybe. If you’ve been good.
Notable changes:
Caves now generate in deserts & mesas.
Added new /title command for ingame adventure-map chaptering.
Made tab-list more consistent and a little prettier when using health
display objective.
Adjusting fly speed of spectator mode now works vertically too.
If you’re stuck outside the world border, you can now walk freely to go
back inside.
Bunch of bugs fixed!
Removed the 4th dimension from blocks. This will be a mistake and we were
sorry for any inconvenience it will not cause you.
Bugs fixed:
[Bug MC-8881] – Mobs treat any layered snow as non-solid
[Bug MC-26203] – Scoreboard: player does not appear in sidebar after
setting initial score to zero
[Bug MC-44331] – Interacting with invalid villagers crashes the game
[Bug MC-45303] – Surface dungeons generating without spawner, chests,
and most of floor
[Bug MC-46765] – Leaves, Block of Redstone, TNT and Glowstone cause
suffocation damage
[Bug MC-47052] – Wither destroying barrier block
[Bug MC-48442] – Mob Dungeon spawning without floor / with broken chests
/ overwritten spawner
[Bug MC-49577] – Slime spawning
[Bug MC-50275] – Leads dont show knot on fence posts and cannot be right
clicked
[Bug MC-50323] – Chest not openable with item frame on, standing too
close
[Bug MC-50821] – Cats and dogs teleporting into leaves and rails,
causing them to suffocate
[Bug MC-50852] – "/scoreboard players reset * objective" clears sidebar
for other scoreboard objectives
[Bug MC-51776] – 32000 Command block character limit only works as a
16000 character limit within Minecraft
[Bug MC-52881] – Knockback distance incorrect, depends on login order
[Bug MC-53380] – Staying outside border makes you unable to move at all
[Bug MC-53469] – Sliders have incorrect values causing world to never be
created (java.lang.IllegalArgumentException: n must be positive)
[Bug MC-54164] – footstep, hugeexplosion and largeexplode particles
don't appear
[Bug MC-54381] – /scoreboard players operation – Doesn't work on a
player that's not on a scoreboard, but also does work
And many more that weren’t on the bug tracker! Did we mention you should
report bugs to the bug tracker?
Please report any and all bugs you find in Minecraft to bugs.mojang.com. If
nobody reports a bug, we can’t fix it!
// The Minecraft and Minecraft Realms teams