Might be the technology used by all recent Canon cameras, because my small Canon Powershot ELPH 115 IS also gets similar picturea and videos with the prop producing an expected blurred arc rather than a ghost scimitar effect.
Video taken with default settings, where I shoot through the prop about half way through; prop doesn't show scimitar effect: http://vimeo.com/80165318
Attached is typical photo shot through the prop when it has swung into view when the shot is take . On occasion I get no prop showing at all.