Farm Tile Ghost Blueprint Interaction

If you place down a farm tile blueprint, and then select a differen tile type and hover over the blueprint, a ghost blueprint of the latter tile type will overlay over the blueprint of the farm tile. These do not disappear when the farm tile is built or if you cancel the farm tile. They are not real orders and do not appear to affect the game at all. They can be removed by hovering over them again with the same tile type once the order is completed or cancelled.