Java Edition 13w23b

13w23b was released to fix some of the bugs and crashes in the 13w23a snapshot.

Additions

 * Added Health Boost effect
 * Also, both the attribute and the potion effect now show the hearts
 * Golden apples now also give the effect

Changes

 * New zombie mechanics and AI.
 * Able to lock onto the player from much further away.
 * Mobbing zombies can now move when further than 32 blocks from player.
 * Spawn additional zombies when not being looked at.
 * Normal golden apples now give Regeneration II for 10 seconds

Fixes
2 bugs fixed

From the 1.6.1 snapshots
 * – ALL Spawners with ActiveEffects crash the game, breaking hundreds of custom maps and servers.

From the previous snapshot
 * – Golden Apples only heal one heart compared to two in version 1.5.2