Quest Issue: Gindlin's Poison

[Passenger]

The quest Gindlin's Poison does not function as expected. Gindlin responds to hails and offers the appropriate quest prompts, but when I turned in the 2 Spider Venom Sacs, 1 Crows Special Brew (purchased from Crow in North Qeynos), and the 20 GP as instructed, Gindlin offers nothing in return. This quest was attempted at Indifferent faction, and faction spells were not able to increase it any further.

Perhaps this quest is flagged as Rogue only?