Revolut Manager interview questions

There were several rounds of interview and online assessments. Managed to pass the assessments and 2 rounds of interview (skills and problem solving). However, did not manage to pass the last interview (bar raiser). For some reason, during the last interview, Revolut assigned an interviewer that was unrelated to the role I am applying for. The interviewer seemed to be conducting interview for the sake of it and was not interested in my responses as per the facial expression. Coincidentally, the interviewer is from a country that is known to prefer hiring their own countrymen -unconsicous biasness (refer to reddit or google and you can find the country). Revolut may want to prevent unconscious biasness and do a review of the number of applicants hired and rejected by such interviewer based on applicants' nationality to check. I have no issues with the first 2 interviewers and they were able to relate to my responses as they are related to the role I am appying for.

Average recruiter screening, 30 min, usual CV questions about previous experience. After CV presentation was asked standard recruiting questions (what was your most difficult business challenge?) and had 10 min to ask questions