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CONTAP-670177: Risk of incorrect data being written for >=9.18 FlexCache with <9.18.1 FlexCache origin

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ontap-9
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CORE
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Issue

Under certain mixed-version FlexCache configurations involving a 9.18.1 cache and a pre-9.18.1 origin, write-back operations may not behave as intended. As a result, data written through the cache may not be preserved on the origin volume.

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