Yep, I had two interview processes that did this... 8 times, at the same time. Both said no after 8 interviews because of one person in the process who didn't like me, everyone else supposedly were on board.
It genuinely took me another year to even consider applying to another job it was so demoralizing.
It's funny (sad) because these are tech companies. Film a single interview and have the others review the video. Would save all involved a huge amount of time and effort while also providing a solid pathway for improving the interview process over time in a systematic manner.
For many places it's unspoken but true, it's about breaking you down and making you reframe your experience, either you constantly excuse the behavior or you'll not fit in with their weird toxic positivity.
They told me I could re-apply in six months and encouraged me (seemingly genuinely) to re-apply for their capricious activity, I just laughed in their face.