To be fair I'd hope during peer review this would be apparent.

During your write up, I'd imagine you would check it's not already out there too. And once complete it's cheap and easy to run it through an LLM and ask is this covered by anything else out there. If its novel and not published it doesn't matter what others say.

Research is already messy as it stands. Something new can already be dismissed by incumbents as "not novel enough" especially in niche fields where they're likely to be the ones conducting peer review.