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Edit Colors > Convert to Grayscale wrote the new image as an RGBA PNG, so a PDF wrote it as DeviceRGB, in a CMYK document too. The image is now stored as a gray PNG, with alpha only when some pixel is not opaque. Adjust Colors with mode gray and convert does the same. An RGB image whose pixels are already neutral now converts, and an image already stored as gray with no visible change is left as it is.