You remember four years ago when OnePlus accidentally introduced an X-ray view mode on the OnePlus 8 Pro camera? It happens because of the existence of a color sensor and an infrared filter mode. Out of concern that it would be misused by users, it was disabled in an update. The latest case is more or less the same on CMF Phone 1.
CMF Phone 1 has only one main camera with a 50MP sensor. The second sensor on the camera bump is the depth sensor that the Nothing camera app uses for the 2x portrait mode. The visual capabilities of this sensor are not used and are activated for the user. One of the irresponsible users has used third-party applications and developer mode to activate the visual capabilities of this sensor.
This makes the X-ray view mode usable on the CMF Phone 1. Due to concerns that there will be more misuse issues, the Nothing OS on the CMF Phone 1 no longer allows third-party camera apps to access the device's depth sensor.