Wonders How long it will be til Final Spring Creators out, due to this issue that I also experienced, relying on Windows Defender til it's final lol, I know option to restore system drive image or clean install to go back to 1709, but trying to avoid another clean install, moral lesson here don't run Insider Release preview or install a Windows OS update early in an attempt to save time lol
I figured was "sorta final lmao" so I was like yeah install early while I got time, did on 3 systems lol, then stopped before did 4th one