
I would love to see a fantasy novel where the lore that the reader / protagonist learns at first is not true

e.g. they're told that this kind of creature has some kind of psychic or pheromone-based "mate bond" that cannot be broken; but it turns out that's a popular myth that has never been scientifically substantiated, and is basically used to keep people in bad relationships (basically the equivalent of "human women are biologically submissive")

"lore" is imo too often treated like information that the author is giving the reader, and it just happens to be using the medium of diagetic (that is, 'in-story') exposition.
it's so much more interesting and dynamic to treat "lore" as information that is generated and disseminated in-story. who is telling the protagonist this information? under what historical and social circumstances was this idea formed? what political motives are there for trying to get people to believe this information? which characters would disagree with it? would the protagonist believe it, or be sceptical? does the plot bear it out, or cast doubt on it?