Bugged power crystal in Crossroads near Eluvian to Arlatan

I recently ran into a bug with the power crystal near the Arlatan eluvian (can´t be picked up). According to the discussions I read, I progressed further in the story after the mission The Siege of Weisshaup, where the so-called reset the map should happen, but the crystal still can't be picked up.
Any advice or do I have to reset from certain save.

Thx to anyone who can help.

Ps: I am sorry if this is written poorly.