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It’s a huge universe, why would this particular entity have to show up in another episode? It could be off exploring the Gamma quadrant.
Why would Starfleet be so fundamentally uninterested in learning about an enitity literally birthed by one of their Starships?
Because they can’t find it? It’s tiny, it flew off into the distance…for all we know, there are a dozen science ships looking for it during the entire DS9 run.