Grass Paths Bug

1. When You place Trapdoors

{Iron,Wooden}

over an Grass Path it became Dirt, also you can't make the grass to grass path while it is under the trapdoors..
2. You can't Make Grass to grass path while is underwater, but you can Do it first Grass to Grass path and then put water Please Fix that bug so You can't put water on top of the grass pah.