I recently completed a challenge related to doing some general activities in the Dreaming City while doing a Lost Sector (Aphelion's Rest - Legend. Helmet drops). Being Legend difficulty, my gear was locked. Whether this is related to this or not, I don't know. Anyway, after clearing the sector I tried to claim the challenge, but I couldn't see it anywhere on the list. The banner for seasonal challenges still flashes the unclaimed challenges message, even in the season tab in the Director, but I cannot see any challenge on the list that is claimable. The bad thing about this is that 1. I have a constant reminder to claim a challenge which I cannot actually claim, and 2. I completed a challenge and cannot claim the rewards.