As of Patch 3.1.0 the benefits of this enhancement do not become active until level 60, thus effectively nerfing it for Twinks below that level. Although the enchantment is not removed from your existing item, you will not receive the benefit of this enhancement unless you meet the new level requirements. Thus the new in-game tool tip now shows "Enchantment Requires Level 60" in red font (indicating the enhancement is not active) if your character is below the required level.