Enemies disappear (Deus Ex: Mankind Divided)

Already 2 times I noticed.
For example squat has gone into the closed area, took the gun and wanted tihou to go, Stopped, turned around, NO enemy. Vision through walls checked, nope!
And Luggage looks at me yellow, and not firing.

This, too, was lost the enemy in the beginning of the game. Just came into the room, and it is gone.
However, I do not see how they lost, were simply turned away, walked around, no.

Can eat on the courts of ass to approach, they where go?