Apple 12 camera has dust.

Look at the shape of the spot, it must be that the dust has fallen into the camera.

In the process of making mobile phone camera, there may be hidden dust that is not cleaned up, which may fall on the sensor surface, or be imaged as black spots or black blocks on the infrared filter of the lens during use. Judging from your picture, it belongs to black blocks, mostly caused by dust on IR.

This phenomenon usually happens inside the camera. To solve this problem:

Send it for repair

Try tapping the phone, there is a chance that the dust will move from infrared to other places without imaging.