Thinking aloud… one thing I have noticed (and maybe others have too) is there are pauses when using the BIOS. The BIOS just stops responding for a few seconds and queues the keystrokes - you have to wait for it to seemingly wake up and then you can resume the work.
I think these IPMI sensor drop-outs are somehow related - maybe?
Before I updated the BMC firmware to 1.13.0 I was getting lots of messages in the BMC screens about the chipset fan speed. I could see the fan spinning but the rpm’s reported would go from 0-2200 ( as I recall ). And the item would drop off of the list of sensors affter a few seconds.
After the firmware update, no errors. The CPU speed was also sensing 0 sometimes.
When I looked in HWinfo it showed more reasonable readings, off of the same sensors, even before the firmware update.
Sure, the BIOS will boot. But it won’t handle reading the sensors correctly if programmed incorrectly with wrong device addresses or bus contentions. That was the garbage BIOS for the Crosshair VII Hero mobo for a year.