In real life they might have a shunt resistance of a megaohm or more. You’ll see in a minute that doesn’t matter very much. But the imperfect wires do have an impact.

BGA Precision Resistor Networks Eliminate Parasitic Effects, Shunt Resistance. May 7, 2007. Packaged in a ball-grid array ... (BGA) package with all circuits on the bottom side of the device.