Possibly a bug: Surface block stones require 3 dirt and 3 stone to produce, but don’t give any resource output.
While it is potentially understandable, it is definitely unexpected for me.
Non modded game does not have drops for grass, which is what surface stones spawns.
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Okay, that makes sense then. I guess the (perceived) issue lies with how the geomancer places blocks, with apparently grass being “naturally” only a single layer, but 5 layers when placed as a surface block.
I really wish, the summoned blocks would look more like procedurally generated landscape 
Currently they stand out from their environment quite a lot, due to being a single color (otherwise only seen underground).