did you tried clearing the indexscenery folder ?
I had lot of ctd after update, after reading this thread, I don’t had any issue since CTD just after a small update
try to delete the content of these 2 folders (before starting the simulator)
C:\Users\YourUser\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\SceneryIndexes
and
C:\Users\YourUser\AppData\Local\FlightSimulator (Don’t worry, they will create themselves when you start the simulator)