SOLV Energy Software Developer - Data Scientist interview questions

Had an interview with hiring manager first, then technical interview with 2 others from the software team, then a one week "take home" assignment, then a final round interview with larger software team. First two interviews were casual and respectful. The last interview felt like they had maybe already made a decision? The formerly warm and friendly people were cold and half the people didn't even have their cameras on. Very weird feeling. Ultimately, after three interviews and a take home assignment, I was rejected through an automated email with no further explanation, even after politely emailing the hiring manager for feedback. People deserve to be treated better than that.