no data for Zone 0 (hw.acpi.thermal.tz0.temerature) temperature sensor

[RoamingJay]

The CPU is intel C3758 so I enabled the intel core sensor under the Miscellaneous setting.
It shows the CPU's core temperature, but there is also an extra line Zone 0, not sure what is this for.

In the BIOS, there are 2 other temperature sensors.

I don't really need that temperature since I can get an idea of how hot the board is from the CPU temperature,
just curious if this is an known symptom or the like, and if any hotfix.

Thanks