Working on a new layout with a LOT of trees on the hillside. 3 tunnels run through the hillside. On each tunnel, for a period while entering the tunnel, I can see the shadows of the trees inside of the tunnel! Is this normal? Really weird. Took me a little while to figure out what I was seeing. Also, at the beginning of the inside of the tunnel, it seem extremely bright like the sunlight is bleeding through the dirt and illuminating the tunnel.