Avoid long traces to connect the sensor to the FDC1004-Q1. Short traces reduce parasitic capacitances between shield versus input channel and parasitic resistance between input channel versus GND and shield versus GND.

The sensor in many cases is simply a metal surface on a PCB, therefore the sensor must be protected with solder resist to avoid short circuits and limit any corrosion. Any change in the sensor can result in a change in system performance.