The 2020 census had big undercounts of Black people, Latinos and Native Americans

https://www.npr.org/2022/03/10/ [login to see] /2020-census-accuracy-undercount-overcount-data-quality
The 2020 census continued a longstanding trend of undercounting Black people, Latinos and Native Americans, while overcounting people who identified as white and not Latino, according to estimates from a report the U.S. Census Bureau released Thursday.

Latinos — with a net undercount rate of 4.99% — were left out of the 2020 census at more than three times the rate of a decade earlier.

Among Native Americans living on reservations (5.64%) and Black people (3.30%), the net undercount rates were numerically higher but not statistically different from the 2010 rates.

People who identified as white and not Latino were overcounted at a net rate of 1.64%, almost double the rate in 2010. Asian Americans were also overcounted (2.62%). The bureau said based on its estimates, it's unclear how well the 2020 tally counted Pacific Islanders.