Envy from United in Dream not affected by Enlighten

As title says, when you socket an enlighen gem into the unique item United in Dream, the aura reserve is not affected. Enlighten, unlike empower and enhance, does not specify that it only affects aura skill gems and only has a multiplier on it, so it SHOULD work, unless enlighten has a hidden passive of only working on aura skill gems.

This screenshot album shows the weapon united in dream with the following socketed gems: Haste, enlighten lvl 4, Generosity. Both envy and haste have a base mana reserve of 50% and so should both have the same reserve at all times (in the case of my build being 30% mana reserve). Envy still maintains the mana cost without an enlighten (33%) while haste has the correct mana reserve total (30%). Also, in the envy tooltip, the enlighten support skill gem is indicated on the haste aura with the blue +, where in the envy skill tooltip it is not.

http://imgur.com/a/8piRO

Thank you for your time reading and hope this gets figured out even though it is fairly minor!

Enlighten, like Empower and Enhance, only supports Active Skill Gems. Unlike them, it does not explicitly list this.