ZOmbies behave like zombie pigman inside creative mode

When you hit a zombie inside creative, all zombies near them will go toward you when you hit them.
tested at single player, no mods installed

Reproduceable steps:
Make a new world inside creative mode
Make it nigth (so the zombies dont burn when you place them)
place 2 zombies
hit 1 zombie
see them both trying to attack you

Not tested inside earlier releases