I'm guessing it's the same common issue present on many Gigabyte AM4 boards. The IT8792E (and perhaps others) doesn't work with the kernel driver. There are workarounds but they make it so that other ITxxxxE chips don't work. I have a Gigabyte X570 Ultra and can only use ~half of the fan headers with lm_sensors. I haven't been able to get them all working.
https://github.com/LibreHardwareMonitor/LibreHardwareMonitor/issues/251 Here's some more info that may be useful.
Edit: or section 6.6 of the Arch wiki link you shared.