In the Cursed Shore zone there are two glitched Skill Challenges : The Orrian Spectral Hammer in the South Eastern portion of the map is glitched and not able to be completed along with the Orrian Spectral Sword in the maze located just east of Bakkir Sarayi POI.
In Malchor’s Leap the Skill Challenge at Bayt Fallahin is also bugged and not able to be completed.