The Witcher is my specifically chosen example because people famously lost their minds about the Netflix adaptation moving to cast characters in it as nonwhite. ...because It Is Supposed To Be Based On Medieval Poland, Of Course. So you can see the weird tensions around the "historical accuracy" of fantasy – people have strong reactions, pretty high-stakes stuff.
If you hadn't heard of this, there's a lot of press coverage, but here's a petition with 50k signatories. https://www.change.org/p/lauren-s-hissrich-don-t-limit-ciri-...
(If anyone is considering commenting about their opinions on this kind of casting being Good or Bad, let's not – the point is that the Witcher's "historical accuracy" is something people have a lot of feelings about.)