The interview lasted for two hours, and we had a good conversation. However, I learned that I was the backup plan ("Plan B") for the position. Another candidate had already received an offer, and I was being interviewed in case she couldn't accept it. Suddenly, my second round interview was canceled because the primary candidate successfully obtained their visa. While it's disappointing, I'm grateful they didn't waste more of my time, and I appreciate the opportunity to have been considered.