Sorry, but I don't think your modular terrains fits well in godot "Terrains" feature, cause they are a little with offset in some tiles and there is missing tiles in the last set. The whole purpose in this feature is to draw on the terrain you want. For example, if I want to do a grass terrain e need to draw on top the grass, but as you can see I can't with this set because the grass is not properly placed in the set. Check the other set that I used in another project and see that the drawing of the terrains sets perfectly over the water tiles. That's what we want for a Godot modular project.
Can you fix this? Please.