I've recently maxed the Psijic skill line on one of my characters and didn't find any bugs such as the one you describe. Are you sure you've been to every spot and closed the breach? If you're 100% sure you have, maybe try to submit a ticket.
Well, usually it would mean you forgot to close one spot somewhere... since I did this one twice already, and never had any bug-out on me yet. Still... could be a new bug? I'd check again,and visually inspected each side to see if it has a "closed breach" at the place I remember... after that, if its really buggy, its either a support ticket, or dropping the quest and seeing what happens when you pick ip up again to do anew...