Isn't this just Humanity's Wake?
Possible duplicated trope
Humanity's Wake is about humanity no longer being around.
This trope is about when there was an advanced human civilization far back enough as to be prehistory to modern mankind. Modern mankind is still around and now has to contend with this legacy.
If anyone has an alternate name suggestion that might be clearer, I'm all ears. TVT uses "Advanced Ancient Humans". Perhaps "Humans Are Their Own Precursors"? "Precursor Human Civilization"?
That explanation reminded me of an example that Looney Toons is currently writing a fanfic about...
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