DIG14 on HiFive1 Rev B - Road to Nowhere?

I’m looking at the HiFive1 Rev B schematic and noticed that the DIG14 (on J4) is not connected:HiFive1_B01_-_a4546ced-0922-4d87-9334-e97c1a9fd9a5_hifive1_b01_schematics_pdf

But on the board itself it is labeled 14 vs. NC or blank. I’m curious as to why it isn’t connected and whether or not it “explains” that there are 19 GPIOs advertised vs. 20.