Meta Software Engineer Internship interview questions

Applied through a referral, then a university recruiter reached out to me, and scheduled the first round. During the first round, I was asked 2 questions (20 minutes each) and the difficulty of the questions was between Leetcode medium and hard. After that, there was a second round called "virtual onsite round" and the difficulty of the questions were leetcode medium. The interviewer was pretty much blank during this round. However, I found that this round was relatively easier compared to the previous round. I was able to solve both the questions in the second round but I missed a major edge case. Maybe that's why I got rejected.