From the Hot Fix notes of things they fixed:
・An issue with the Idyllshire NPC "Splendors Vendor" wherein the amount of materials needed to exchange for the following items in "Tradecraft Items" was incorrect:
Purified Coke (HQ) / Raziqcoat (HQ)
Dryad Sap (HQ) / Moonbeam Silk (HQ) / Odorless Animal Fat (HQ)
So it was indeed a bug, as we all should have known.