Runegraft of the Bound not scaling modifier on Hand of Phrecia

Hand of Phrecia's aura effect modifier should scale with Runegraft of the Bound, but doesn't.

Hand of Phrecia:

"

40% increased Effect of Non-Curse Auras from your Skills while you have a Linked Target

Runegraft of the Bound:

"

20% reduced bonuses gained from Equipped Boots
20% increased bonuses gained from Equipped Gloves

You can verify that the modifier does not scale by following these steps:

1. Equip Hand of Phrecia (gloves), Grace (skill gem), and any link skill.
2. Link a friend and note your evasion rating.
3. Allocate a mastery and apply Runegraft of the Bound.
4. Link a friend and note your evasion rating.

I expected my evasion rating to increase, because Grace now has 8% increased effect. Instead, my evasion rating does not change. I tested Determination and Discipline and got similar results.

I thought maybe all unique modifiers are unscalable, but then I tested Widowhail with a variety of unique quivers, and all of them scaled as expected.

Still is bugged sadly