TLDR: Affinity bias is real, not specific to any certain race like this thread suggests, and Cigna hasn't done much about it but could very easily improve with HR personnel that actually care.
This issue isn't specific to a certain race at Cigna. I've been a hiring manager for 10 years here and my own manager who is of a different race and gender always prefers candidates who are her same race and gender. I was recently filling a position and had three good candidates but one of the three had clear shortcomings compared to the other two candidates yet she preferred the one, who was the same race and gender as her. This has also applied to the only two promotions that have occured on our team in the last four years. I also experienced it with my previous manager's input on hiring on a different team.
This type of bias is called affinity bias or similarity bias. It was one of many biases that were covered in an optional training I did at Cigna on leadership. How that training is still optional I have no idea.
It is hard to overcome even if you are the hiring manager who is aware of your own bias. I tried something once when hiring a role to overcome any bias I may have: I asked the Cigna HR recruiter to remove/mask all names on the resumes before sending them to me. The recruiter asked why and when I told her about removing bias she still didn't get it. She did it but it was a manual process involving printing the resumes, using white out, and scanning them back in. Maybe with AI tools now it could be more automatic. Or an option in "doesntWorkday". I also recommended to another HR person that we have the option to remove names from initial screenings and it went nowhere.
You would think with a company of our size there would be better requirements on interviewing a certain number of candidates. And while HR does track race/gender statistics at an org chart team level, it's not resulted in anything IMO.