Amazon Infuse Weapon recommended support useless

One of the recommended supports for Infuse Weapon is "Embitter". Since it is recommended I was expecting all the infusions to deal cold damage since it was recommended, but Infuse Weapon is a sepearte attack and does not add damage to the infused projectiles. This means that Embitter does actually nothing unless you have added elemental damage from a different source.

Not sure if this is a bug or the person making the recommendations just didn't know what the skill actually does