Rival Wings exploit - Group matching not random (申請合わせ)

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Date & Time: Probably since the start of Moogle Treasure Trove, but very noticeable since the start of this week. Most rampant during evening peak time
Frequency: Every night
World name: Elemental DC
Character name: -
Retainer name: -
NPC name: -
Monster name: -
Class/Level: -
Party or solo: -
In-game time: -
Area and coordinates: -
Housing: -
Description:
A group of players appear to be exploiting the queueing system for Rival Wings (Hidden Gorge). We keep running into the same alliance of pre-made group.
Seems to be the same issue that happened with Frontline and was fixed some time ago - I believe this exploit is colloquially named 申請合わせ in the Japanese community.