That was generally true for all img tags for images loaded via its src attribute as that was the spec (to ignore exif and not post process it). At some point around Chrome version 81 (and earlier for Safari, not sure about Firefox) that changed. So any ebook e-reading sdk based on an earlier spec engine, would ignore the exif.
So cleaning up the image files and removing the exif first is the best approach to make an epub that is compatible with the most e-readers.
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