In my case, it was the FSLTL injector. Whenever I turned it on today, I had a CTD either on the ground or a few mins after takeoff. Had this 5 times in a row, on the 6th time, I didn’t turn it on and perfectly completed a short route with ATR from RCSS to RCQC.
After that, had a longer flight, again without turning on the injector, from LCLK to LSZH with FBW A32nx (finally working in msfs 24) and again - completed without a problem.
So as long as FSLTL isn’t compatible with the sim, don’t turn on the injector.