Zombies been alerted by other zombies in creative mode turn not passiv after a short time. The zombie is only passive when you attack him.
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duplicates 1
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If you attack a zombie, then alerted the attacked zombie other zombies near, so they attack the players, even if they are not within his reach. Normally mobs attacking in creative mode, turn after a short time passive. The alerted zombies remain permanently aggressive.
Think he means when you hit a Zombie in Creative, any nearby Zombies will chase after him, and never lose aggro, even if the Zombie he hit does go back to being "peaceful" after being hit. Is that right?
Duplicate of MC-2638.

No Duplicate. This is about Zombies and the new features.
It's the same bug: that certain mobs remain aggressive.
i have a similar problem: natural zombies (not summoned or from eggs) are aggressive. Should i report this as its own bug?
What? Can you please try to explain this again?