This might be a big ask but - I really need blob tilesets of the grass and snow. I want the player to be able to dig up grass to decide where there are dirt patches on the farm, and I just can't get Godot to autotile correctly with just the supplied tiles. I've tried everything I could think of, every bitmask configuration and even plugins. I ended up making my own blob tilesets with the program Tilesetter. They technically work great but need some love from a real pixel artist. Here's my best grass attempt so far: 
Could you possibly take a look at this for an update?