This happens almost every time that the GR Guardian spawns back in an explored area, but is not in range for more than the arrow pointing back the way the bot has already been. Instead of back-tracking, the bot seems to prefer seeking the Guardian only in places it has not yet been. Once I even saw it come to the door to a new zone and go through into the empty zone and get stuck there.
If the Guardian icon is on the map, bot seems to get it right.
If the Guardian icon is on the map, bot seems to get it right.