For both the Arty Z7-10 and Z7-20, the part0_pins.xml files both have incorrect assignments for IO10 and CK_SS.
F16 is CK_SS, and T16 is IO10, according to XDC file and schematic.
F16 is IO10, and T16 is CK_SS, according to (bad) XML part0_pins.xml files.
For both the Arty Z7-10 and Z7-20, the part0_pins.xml files both have incorrect assignments for IO10 and CK_SS. F16 is CK_SS, and T16 is IO10, according to XDC file and schematic. F16 is IO10, and T16 is CK_SS, according to (bad) XML part0_pins.xml files.