Blocks don't "carry" any unconfirmed transactions. By definition, a transaction is confirmed when it's included in a block.
Importantly, the block height when the transaction entered the mempool might be different from one mempool to another, as transactions take time to propagate through the network and a new block might be mined while it's propagating. It will also be different for transactions that your node receives from its peers when it's starting again after a downtime, since those transactions may have been in their mempool for many blocks already.
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