The Xiaomi Mi Mix 4 could be the first smartphone to market with an under-display selfie camera if leaked photos of the device in the wild are accurate. In fact, based on what is shown in the photos, the Mi Mix 4 might have two under-display cameras possibly one regular and one with a wide-angle lens, although it might be a sensor.
https://www.notebookcheck.net/Mi-Mix-4-underdisplay-selfie-camera-confirmed-in-live-photos.440637.0.html
According to Ice Universe its fake:
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If it's that visible under regular office lighting, it will be much more visible under sunlight.