Steps to reproduce
Spawn in a hostile mob (e.g. zombie) and throw an invisibility potion at it
Spawn in an iron golem near it and observe its behaviour
The golem will go to the mob and kill it.
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i only can confirm this bug!

@Matteo Rainer : Confirming already confirmed tickets is pointless. If you want to help, search for unconfirmed issues and provide steps to reproduce if unclear.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
yes it is but i cant update
also if your going to update this wolves attack invisible sheep and snow golems will chuck snowballs at invisible mobs
Confirmed.