Can't add stars to starmap if at vertical limit viewrange

[krakun]

If an anomaly is at exactly the view range limit along the vertical axis, then I can't add it to the starmap, if it's along the horizontal axis then I can.
Put differently, if traveling north I just barely uncovered a star, then I can't view it's quality and minerals, I have to close in one more tile.
If I was traveling east then I could view its stats immediately.