This is scaremongering
Never encountered such a bug, and the reason the guy doesn't come to the Tower is because he probablly spots you if you are "waiting" and goes back inside.
It also happens around 1AM rather than 12AM so you may be going there early and then he spots you leaving the toer, which is why he doesn't show up.
You may have also taken the path that basically tells the intruder you're looking for him, which also stops him from going to the tower.