3 rounds of interviews. First the HR round, then a personality quiz, the know how round with the engineering manager and then a technical round with the 2 team members

First call with recruiter to understand expectations. Second call was code review. It was very simple for senior developers. Third round was live coding. Sample scenario given in advance. Had to solve 5 unit tests. Last 2 are a bit difficult. I solved all 5. Despite clearing technical rounds I was not put through to the next round since the roll was filled internally. I heard that this happens at bol multiple times. I wasted a month in this process.