I see that Simon Calder speculates on the identity of the flight with the flight plan that triggered the failure :
"The report does not reveal the airline or route, merely saying: “The flight was planned to depart at around 4am [BST] on 28 August, and arrive at around 3pm.”
The service that most closely matches these timings, and passed over UK airspace, is
Air France flight AF85 from San Francisco to Paris CDG. It is scheduled to depart daily at 4am British time and arrive in the French capital at 2.50pm, BST. This is speculation by
The Independent and has not been confirmed."
Is that flight plan accessible to determine the duplicated waypoints ?