Zombies only do their hit animation (swing their arms) when they are holding something in their hands. They should do their hit animation no matter what.
Comments 3
Is this still a concern in the current Minecraft version 14w30c or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Please do not mark unreleased versions (anything starting with "Future Version") as affected. You don't have access to them yet.