While checking out my system using hardinfo I came across this temprature reading. I can’t figure out where this sensor is located, but I’m not too worried since my pc is not actually on fire/melting. Is this a known bug?
No, you shouldn’t. It only means that thermal sensor on your motherboard lacks proper support form the operating system.
There are a lot of results obtained from hw-probe showing exactly the same temperature (216 °C) for Asus ROG Strix X470-F Gaming: [1], [2], [3], [4], [5]