Cancelling IFR once airborn causes serious mission bug and taxi prompts

I am increasingly getting a bug when cancelling IFR on some Passenger Transport flights which causes the Mission Steps to prompt me to taxi even though I am already airborn.

  • Press Enter to announce taxi
  • Press Enter to request taxi clearance
  • Hold Space to brake and stop at hold short
  • Press F to decrease engine power.
    I instantly receive a penalty for speeding while taxiing despite not being on the ground.

Once this error/bug occurs it is impossible to continue with the mission as it ends in an unexpected error once I land at destination. I have spent at times 8 hours flying only for the flight to crash. VERY FRUSTRATING!