I’ve seen something like this, for a long while and multiple firmware versions, in linux. It seems to me to depend on if I’ve accessed the sensor data “frequently”. The “cpu@4c” sensor can get stuck in an error state, and the EC auto fan control doesn’t work anymore, until the sensor starts working again (which usually needs a suspend or restart). But if I avoid accessing this sensor “too much” with ectool / lm-sensors, and avoid having a dock/bar widget which does so, then it works fine indefinitely.
Related thread: [RESPONDED] FW 13 7840U ACPI thermal readout problem - #22 by Steve-Tech