While checking whether a Meditation Garden would capture two resource nodes that seemed too far from another, I discovered that there was a cursor position that would indicate that a resource node would be included in the radius, even though the position of the building did not move, and the projected income did not update.
external screenshots because the upload here allows only one
The first image shows the stone outcropping to be in range when the position of the landmark is the same that captures the two gold veins in the second image.