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It's hard to tell, but it could be the machining. If there is a sharp corner at the base of the bearing register, it could cause a stress riser, letting a crack start, and progress until failure.
Wheel hop is most likely from a standing start, where the rear tire literally hops or chatters do to suspension compliance. On a track car I think more of curb hopping or dropping wheels, letting the rear tire spin-then grip, shocking the drivetrain.
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