I was using the blend ball brush the other day and noticed the dirt I was smoothing (using this brush) changed data values.

I only saw dirt change data values, but then again, most terrain blocks doesn't have extra textures on their data values. (However Palceon do due to CTM). The brush was used very close to the void.

The sniping was done on The Voxel Box and thereby I assume the plugin was #244 - VoxelSniper-5.168.7-SNAPSHOT.jar.