Portenta USB ports shorted together?

Looks like R44 and R45 short the two USB ports (USB-F and USB-H) together. Anyone know why? Something to do with booting?

Reference manual RM0399 says the bootloader checks the USB-FS, not the USB-HS, so R44 and R45 need to be in place in order to boot thru the installed USB connector. So in order to free up the second USB port, I need to remove those resistors...