This campaign was thankfully done on mine with 16 miles on the odo, it doesn't explain exactly what the contamination was/from, but if yours was built from 10/18-10/19 you should ensure it was done. There's also a recall for the M8 but it does not indicate what for.
https://static.nhtsa.gov/odi/tsbs/20...69456-9999.pdf
https://www.nhtsa.gov/vehicle/2020/BMW/M8