So Dredgeworks adds underwater patches that get deleted when you landfill them, but adds floating drills and belts that your mod recognizes but still attempts to use landfill
so it just deletes the underwater patch with landfill regardless of how I adjust the selections, unless I have enough bots and items to completely cover the patch in a single bot deployment, before the mod can put landfill under the seafloor drills and floating belts