This week's Ascendent challenge finally gave me 6/6 progression on the Ascendent Champion Triumph, thus resulting in my Cursebreaker title.
Mine was stuck on 4/6 prior to season of the chosen. After the season started, I decided to do all 6 challenges again and Keep of Honed Edges and Ouroboros finally gave me the final 2 progression.
I'm sharing because many of us have been working on the Cursebreaker with this bug for over half a year. Hopefully this means the Triumph is fixed and this posts motivates someone to try and complete their title.
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Bungie.net showed I had completed 6/6 but in game showed 5/6. Saw your post and took a chance with this weeks (Ouroborea) and it ticked over for me. Cheers for the heads up :)