Until today I did not have that issue - I just select the next leg and got the flightplan. But today I have the same problem - when I want to just continue, then I have no flightplan (Norway bush trip, if it matters).
However, I will try your advise with repeating the last leg.
PS: One reason for me to always return to the main menu and then come back and continue, was the issue, that only the last leg was saved in the log book, when I was flying one leg directly after another. I did not checked, if this works now with new update.
( (Bordeaux) Bush trip - completed legs not recorded in the Pilots log - Bugs & Issues )