I'm having an issue whenever a character with nightvision stands near a light source in an otherwise dark area. The inner part of the circle of light emitted by appears to the character as normal, and everything beyond the edge of the light source appears normal, but the edge of the light source is a black gradient, making that part of the map dark to the character. I've attached a screenshot for reference. The character with the yellow aura (with the name Clehrin) has darkvision to 60 ft. For the image, I'm using CTRL+L so we can see from her perspective. The character with the white aura is holding a torch emitting 15 ft. of bright and 15 ft. of dim light. I cannot for the life of me figure out how to get rid of this weird black gradient. Any idea what's going on and how to fix this?