Stratum server builds transactions not node. Node propagates it

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Do you mean DATUM? It can only construct a block according to the rules of the node (and mempool) that it is connected to.

Datum is a stratum server

It's depends on the node you run. The mempool policy you run on your node determine the block template that will be built.

new transactions are stored in a node's memory pool while they're waiting to get mined on to the blockchain.