Engine shutdown problem
I have followed this thread from the beginning but can't recall if the actual achieved thrust setting(s) for Engine #1 have been reported for the various stages of flight up to the attempted shutdown.
I can add that the fuel valve associated with electronic engine control systems of earlier FADECs did latch at the current setting after some failures but later ones, and I assume the Trent 900 is included, the valve would drop back to an idle setting.
I would be very surprised if a high power setting existed during the approach and landing due to the huge handling problems that would arise.