[Python] Read 16 bit color depth image with Wand

I want to process a 24-bit image in 16-bit mode with Wand. This is how I read the image

from wand.image import Image as WandImage

source_file='img/in.tif'

with WandImage(filename=source_file, depth=16) as img:
print(img.depth)
print(max(img.export_pixels()))


the output is 8 and 255, so the color depth is still 8 bit. The depth=16 argument did not change anything. What is going wrong? My wand version is

Wand 0.6.13
ImageMagick 7.1.1-38 Q16-HDRI x64 b0ab922:20240901 https://imagemagick.org

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