If the design includes an Image with a gradient or solid color overlay on it/rounded corners/drop shadows, the Export of the image includes everything as a whole and doesn’t include an option to separate the “style layers” for the export. It is an annoyance for both designers and developers as the designers have to go back and duplicate the image without the styling applied to it and the developers are confused about the styling applied to it.
A solution can include having a selection for which items the developer wants to export. e.g. only exporting the image and not any of the edits applied to it