Excessive single crystal returns on retainer quick ventures starting in 7.0

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Date & Time: all times/all days
Frequency: every quick venture
World name: all worlds
Character name: all characters
Retainer name: all retainers
NPC name: n/a
Monster name: n/a
Class/Level: all level 100 retainers of any class
Party or solo: n/a
In-game time: all times
Area and coordinates: all areas
Housing: n/a
Steps:
1. send level 100 retainers of any class on quick ventures
2. when they return, typically 20-30% of them will bring back a single crystal instead of equipment.
3. previously in Endwalker the rate of single crystal rewards was closer to 1-2%

Suspected Conditions: Retainers are bringing back a much higher percentage of ilvl 660 gear in Dawntrail than they did 530 gear in Endwalker. This is great for gearing up jobs, but I suspect that a retainer bringing back duplicate unique items rewards a single crystal instead of a duplicate item.

Suggested Fix: Keep the higher rate of 660 items, it's super helpful for people with 1 or 2 retainers! Instead of lowering the rate, change the "filler" item (e.g. the single crystal reward) to something useful, maybe a new lottery box like the venture coffer or 3.0/4.0 GC coffers but with items inside that include the variety of things retainers typically bring back.

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Adding my voice to this one!

I realized that I finished replacing all my lvl 90 gear of each armor type with Augmented ilvl 660 gear last week and as you mentioned, I've seen a very high increase of single crystals from my retainers since. Almost every hourly return of Quick Venture on my four retainers results in 1-2 crystals.