That'll happen -- and it is a direct result of rehydrating them too quickly. The direct addition of water, even through spraying, creates a heated chemical reaction that can result in decrepitation and cracked beads. The alternative is to allow the beads to absorb the humidity over time from an indirect water source or find a method of spaying that introduces water at a slower rate (spreading the beads out and using a fine mist to rehydrate) -- I spray and deal with a few cracked beads.
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