Forbidden Shako Great Crown doesn't work

Item Class: Helmets
Rarity: Unique
Forbidden Shako
Great Crown
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Quality: +20% (augmented)
Armour: 184 (augmented)
Energy Shield: 37 (augmented)
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Requirements:
Level: 68
Str: 59
Int: 59
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Sockets: W-W-G-G
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Item Level: 85
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Malevolence has 30% increased Mana Reservation Efficiency (enchant)
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Socketed Gems are Supported by Level 3 Predator
Socketed Gems are Supported by Level 31 Impending Doom
+25 to all Attributes

it's my equipment. i link with Temporal Chains-Awakened Void Manipulation-Spell Cascade-Awakened Unbound Ailments in this equipment,it can't trigger Impending Doom. it's my link worry or a bug,please let me know.