The only cause of this would be an impact,often from small snails and so it isn't a warranty issue. If it is very minor you could ignore it. The props are not to expensive at about $9. I could sell you one or you could order one from any of our dealers.
6060 uses prop 6060.12A, 6080- 6080.12A and 6100 and 6000 use prop 6100.120