I have the same issue trying to read the smart data for my plextor M.2 M8PeG drive as well.
Looks like Microsoft changed something that broke it. Just to test, I downloaded CrystalDiskInfo 7.2.0 to see what it would read. Right after the installation it would read the smart data for this disk, but then after rebooting the pc the smart data for the plextor drive also disappeared from that utility.
Attaching my smartdump incase Aida can shed any additional light on this. I do see where it shows up as a device in the smart list , but then no data for the drive is there.
smartdump.txt