[twobitshifter]

There actually is some evidence. I remembered this article but I’m no expert. https://www.smithsonianmag.com/science-nature/dna-search-fir...

[AlotOfReading]

The authors' speculation that this was due to both populations originating in east Asia eventually turned out to be true once further work was done on sequencing Tianyuan man [1]. It's not indicative of Pleistocene trans-pacific contacts.

[1] https://doi.org/10.1016/j.cub.2017.09.030