From what I could find trying in all of the surfaces of Alien Biomes, there is no default pathing surface until you place one.
For example, if you try to build on Green Grass 1 as in your screenshot, the game doesn't know which pathing to use. If you manually place an assembler over Reinforced Concrete and then try to Shift+Click on Green Grass 1, it will autoghost Reinforced Concrete (the last pathing used on Green Grass 1 tile). If you then pave with Stone Bricks, Shift+Clicking will place Stone Bricks ghosts.
I suggest you pave first or update blueprints to have the pavement under the buildings as a workaround. I'm looking into having a default pavement set regardless of the state so this issue doesn't occur with new surfaces/buildings.