Board Thread:Bug Reports/@comment-27785355-20161123125835/@comment-27219153-20161123150957

Yes, they border between the cobblestone and grass correlates with the chunk border, or at least that was in case in beta 29. Basically, it is an issue of order of terrain generation and that the grass won't override cobble. The chunks with cobble generate and then a flower garden/tree generates in another chunk (the one with the grass), but it doesn't go back to the other chunks and change them to grass.