There's actually research on this and it involves scrutiny. If you're Black people are going to look at your work looking for mistakes in a way they would never for white people.
Black Workers Really Do Need to Be Twice as Good
African American employees tend to receive more scrutiny from their bosses than their white colleagues, meaning that small mistakes are more likely to be caught, which over time leads to worse perform...
theatlantic.com
let's be real: plagiarism scandals in academia happen all the time (not because academics plagiarize a lot, but just because of how many millions of faculty there are around the world) and it is never general-public news unless the culprit is a member of a minority.