Snow covered trees bug and lighting

Trees covered in snow don't seem to be rendering any other color than black (shadows). I included a picture to show a better example of the issue I am seeing.

As well, the lighting under any other block doesn't seem to render properly for awhile when starting a new game. The shaded areas are darker than usual, as if traversing in a cave. Can include a picture a bit later as I didn't think of taking a screenshot of it.

Thank you.