Have you found a fix for this yet? My Vortex is also not showing Cyberpunk 2077 in the games managed/unmanaged lists. I tried disabling and re-enabling just to see if that would help it or not (it did not).
I have toggled the "show hidden games" off and on and it never shows up.
Is there another way to add the game to the vortex mod manager if it is not showing up in the list?