In an experiment, I set SurfaceAndGroundControl to use a different color STAINED_CLAY block for each integer value, and then tried replacing the various colors with grass below a certain height, and stone above a certain height, with the height different for each color.

The test failed to differentiate between the different colors, and when I looked in the .bc file, all the STAINED_CLAY:# blocks had been replaced with normal STAINED_CLAY.

@iiegit Does this occur with latest build?