I don't know if it is actually connected to Hardcore Server, but that's it happened.
After doing all other level 5 Feywild quests I talk to Gale Estival and he directs me to Huntress Joranda. She gives me "Witch Hunt" quest. I enter the quest without problems, kill Brutal Beatrice, find the note, talk to the Summer Court Emissary. End chest appears but no fanfare music, and I do not receive the xp.
When I leave the quest, there is no "Quest not completed, are you sure?" warning. But Witch Hunt is still grey in my Quest Panel. Not only it does not show up as "completed", it does not even show up as "accepted" -- normally when you accept a quest, its name turns yellow. When I return to Wynwood Hall, the icon above Joranda's head is grey, meaning I accepted the quest but did not complete it.
Several inconsistencies here.