I have found all of the Enigma Data Handlers apart from the one that is supposed to be under the Steel Mill (over the gate and under the Sionis Industries sign).
I am getting a notification when I am in the vicinity and the icon remains on my map, but the character and the naccompanying hoods are not there.
Will it appear later in the game?
Is it a glitch?
Will this correct itself or is a permanent glitch?
Will it affect how the rest of the game plays out, (i.e. completion)?
Can it be fixed?