The quest tether is still visible even after completing the Jeuno: Second Walk quest. I've completed the entire available questline. If this is intentional, I guess I've never noticed before regarding older Alliance Raids when they were current.
Obviously, I can disable quest tethers entirely as either option removes it, but just posting in case it's unintentional or if I'm misunderstanding the option.
Edit (Aug 20th): Randomly stopped. I don't remember having an update since, so I'm not sure how it fixed, but it did. Closing issue.
Edit 2: It came right back after reloading the area, so never mind.