12 LEG is empty.
there is nothing.
I have the exact same thing on my Xbox series x. Norway, leg 12.
You can fly leg 12. The leg departs ENBO (Bodo) and arrives in ENSH (Helle). Just enter those in the GPS. Fly the route and the leg will show completed after landing in Bodo. The logbook will show you departed ENST, which is incorrect, but then you click NEXT and it takes you to leg 13.
This is a workaround until MS fixes the issue. It should allow you to complete the entire trip.