When direction is in the third quadrant (down and left), stars reappear offscreen

Setting direction in the options to any value in the third quadrant (down and left) causes the stars to go off screen then reappear too far to the left to be seen. This can be done with 270<direction<360 or -90<direction<0. Here's what it looks like after a minute with direction: 359: Notice the stars barely visible at the far left edge of the viewport.