I came across a scenario that I didnt find a fix for on here, and actually figured out on my own. I am running speccy v1.32.740 on Windows 10 Pro 1909. This morning I saw my motherboard temp no longer appeared on the read out. I did a bit of digging and realized the "Guarded Host" feature I recently enabled was interfering with it. After I disabled that feature and rebooted, the temp readout came right back.
Thanks for sharing your solution, hopefully that may help someone else.