As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LEFT ENGINE AUTO FEATHER ENGAGED ON APPROACH PILOT REPORTED PROP FEATHERED FOR ABOUT 3 SEC WHEN POWER WAS REDUCED BEFORE SELECTING FLAP 35. IT CAUSED THE PLANE TO YAW QUITE A BIT CORRECTION P/N OS GOVERNOR 210961C (TC# 20190415001)