Strange yellow dot lines

[ghost]

Occurred in 41d9a20

After starting a new game, I can see a vertical line of yellow dots in the shroud. If I pan the viewport vertically, the line moves with the map. If I pan horizontally, the line disappears and others blink in and out. If I stop panning, a line may persist; if I move back to the original view, the original line reappears.

Not sure what other info to provide.