WT-15663 When returning a cached page from block cache, make sure to make a copy of data.

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• Backlog

WT-15648 Fix memory heap-use-after-free issue when packing the internal page delta

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• Closed

WT-15661 Memory leak in reconciliation in disagg

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• Closed

WT-15676 heap-use-after-free between two eviction threads

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• Closed

WT-15678 Memory leak in __wti_block_disagg_write_internal

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• Closed