I have had reasonable success using the FSUIPC auto save function (has to be a paid registered copy).
Shut down your flight wherever you are, as usual. When next start up of MSFS 2020, and get to the global selection page, hit the shift key and go to the saved flight section and look for the auto save entries and choose the latest one; when FS starts go to PAUSE (mine is FSX style PAUSE which I have mapped to my keyboard - used P for pause on, then rightALT-P to unpause) and check out settings, then unpause and try to salvage the flight - I have usually been successful.
Nigel
Vancouver