iPhone 11 Halide DNG gives black image.

I am using libraw to try and read an image from an iPhone 11. I use the libraw->rawdata.raw_image field to access bayer data.

I have also tried converting the image with dng converter (no compression) and libraw still gives a black image.

Why could this error be happening?

The DNG file is here:
https://drive.google.com/file/d/1SlVyBiHgIamv7Z8G6qhA6A4KyTwxpvqZ/view?u...

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