Bit interview questions

First stage involves a chat with another student developer for 30 minutes about myself and the company. The personality test (I believe should be done after you pass the tech assessment). The technical assessment is a 48-hour assignment, and I was rejected despite feeling that the work I submitted was of high quality and fully met—if not exceeded—the stated requirements. Their feedback claimed that the functionality I implemented wasn’t what they expected, which feels unfair considering how open-ended the assignment was. It ended up being a waste of time. On top of that, they even asked whether the rejection surprised me or if I had anticipated it.