Amazon Web Services SE Intern interview questions

I interviewed for a 1-year internship position and went through three rounds of interviews over several weeks. The process included: Round 1 with the Hiring Manager Round 2 with a Senior Manager An additional interview with another Senior Manager after being informed that the original team had reached headcount capacity. After the third interview, I was verbally informed that my interview feedback was positive and that further internal discussions were taking place. I was then asked to wait for an additional week due to what appeared to be ongoing evaluation. However, after the extended waiting period, I received an automated rejection email without any explanation.

Loop interview for the case study where they will ask on strategies and thought process. Personally, I had surprise interviewers who were not listed in the email details. Not very fair in my opinion