X100F: face detection & photometry

[trnfncb11]

I understand that face detection disables photometry. But I notice some undocumented inconsistencies when face-detection is selected, depending on OVF/EVF selection:

With EVF, the metering icon in the viewfinder displays the appropriate face-detection/eye-detection icon. Photometry choice is disabled. So far so good.

With OVF on / dual EVF off, the metering icon in the viewfinder keeps displaying the underlying selected photometry icon (although photometry selection is disabled). This is wrong and confusing.

With OVF on / dual EVF on, the metering icon also keeps displaying the photometry choice, but it is yellow-colored (undocumented). In addition, a function key assigned to photometry appears to be active, you can choose a photometry mode and the choice is regularly reflected in the viewfinder. Again utterly misleading.

Can somebody explain?