Long story short, while in the review copy/arc phase debut YA author Amélie Wen Zhao first delayed, then cancelled the publication of her first novel (which was a major deal–that is one described as gaining an advance of at least $500,000) Blood Heir. 
Publishers Weekly covers the controversy here.
And Tablet Magazine updates it here.
Personally, not being very active on the YA Twitter community, I’m a little sad, because it sounds like an interesting book I would have liked to read.