Netskope Senior Software Engineer - Fullstack interview questions

First round was a DSA round, with two leetcode medium. Solved them both within about 40 minutes and had 20 mins left to discuss some design approaches. Solved and answered all of them, the interviewer was happy but got rejected. Had to call the HR to understand that as this was a frontend heavy fullstack role it was expected of me to solve in Javascript while I solved them in Java- even while I asked the interviewer if it was ok to solve in any language of my choice and she said yes. Never faced this kind of rejection reason till date.