bug with eldritch exalted orb

cannot add prefix with searing exarch is dominant. It keep reporting the suffix is full, but I'm sure my item is searing earch dominant. Is it a bug?

The following is the item detail:
Item Class: Boots
Rarity: Rare
Brimstone March
Wyvernscale Boots
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Quality: +30% (augmented)
Armour: 306 (augmented)
Evasion Rating: 306 (augmented)
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Requirements:
Level: 84
Str: 98 (unmet)
Dex: 98 (unmet)
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Sockets: G-W W-W
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Item Level: 86
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{ Searing Exarch Implicit Modifier (Grand) }
While a Unique Enemy is in your Presence, 17(16-17)% increased Effect of Onslaught on you (implicit)
(Onslaught grants 20% increased Attack, Cast, and Movement Speed) (implicit)
{ Eater of Worlds Implicit Modifier (Lesser) — Chaos, Ailment }
35(33-35)% chance to Avoid being Poisoned (implicit)
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{ Suffix Modifier "of Tzteosh" (Tier: 1) — Elemental, Fire, Resistance }
+48(46-48)% to Fire Resistance
{ Suffix Modifier "of Nullification" (Tier: 1) }
+14(13-14)% chance to Suppress Spell Damage
(50% of Damage from Suppressed Hits and Ailments they inflict is prevented)
{ Suffix Modifier "of Bameth" (Tier: 1) — Chaos, Resistance }
+31(31-35)% to Chaos Resistance
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Split
Searing Exarch Item
Eater of Worlds Item

I have the same issue

https://www.pathofexile.com/forum/view-thread/3804164

GGG is already aware.