Egi Assault for Summon II (Titan Egi) does not trigger Enhanced Ruin II's effect

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Date & Time: N/A
Frequency: Always
World name: Tonberry
Character name: Cherry Pop
Retainer name: N/A
NPC name: N/A
Monster name: N/A
Class/Level: 63
Party or solo: Both
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Steps:
1. Be level 62+ (Required for the trait Enhanced Ruin II)
2. Cast Summon II
3. Cast Egi Assault
4. Further Ruin does NOT trigger

Enhanced Ruin II's tooltip states "Grants Further Ruin upon using Egi Assault", this does NOT occur when the summoned Egi is Titan Egi (Summon II) and is therefore a bug.

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This is working as intended, take a closer look at the trait Enhanced Ruin II, you'll note that there's a mention of "The Egi Assault used must be an attack action".
Titan-Egi's Egi Assault I is Earthen Armor, a non-attack ability that grants a barrier to the summoner who orders it.