From Minecraft Wiki
June 7, 2013
- Added Health Boost effect
- Also, both the attribute and the potion effect now show the hearts
- Golden apples now also give the effect
- 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
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