Floriensis is a particularly good one, due to the Ebu Gogo mythology - and they seemingly died out 50kya ago. The locals specifically didn’t have giant humans in their mythology, rather tiny ones.

And then you go look at where there were Denisovans and Neanderthals, and those cultures have mythologies with trolls and ogres.

The absence of evidence is not evidence of absence - in fact, it is speculated that floriensis perhaps hung on much, much later than 50kya ago - and I see no reason the same shouldn’t apply to Neanderthals or denisovans.

On a similar note - cultural memory runs deep. Take hill forts in the U.K. for instance. Commonly accepted as defensive structures. Except… the populations of these places, the topography, all of it, made them pretty crap defences - and the top of a windy hill, far from water, isn’t such a great place to live. So why? My take: the doggerland flood, and cultural memory. When the sea is slowly encroaching, building on top of a hill, building a dyke, a berm, sensible.

5000 years later, still doing the same thing. Why? Nobody quite remembers, but it’s important.