"Offering" branch of Bishop seems to give wrong item

I gave the offering to the Fabled Bishop in the arena.
It gave me "Automaton's Potion."
However the quest still is unfulfilled and says it wants "Automaton's Charm Oil."

I can find no way to turn the former into the latter.

Is this branch, as opposed to killing it, giving an outdated item?

UPDATE: it gives both. My "helper" yoinked the quest item. The outdated item was placed directly into my inventory.