Polar Censorship?

Are we perhaps victims of a campaign of censorship? It just seems all-too-convenient that the poles of these images are either missing or covered. Take for example this image of Jupiter's north pole which is a reconstruction of photos taken by Voyager 1 in 1979.
In this view of Jupiter's southern pole, constructed from images taken by the Cassini spacecraft in December, 2000, one can make out how the center of the image has been greyed out. But for what purpose? And to what end?

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