I'll try to elaborate and provide as much details as possible.
My interview was scheduled for 1 PM- 1:30 PM and I was supposed to login 10 mins prior. My interviewer never showed up. I contacted Amazon around 1:10 to which they replied around 1:30 PM rescheduling it to 4 PM. So things weren't going as planned so far. At 4 PM, the interviewer came online and started talking about himself. He didn't ask me anything(Like no ice breaker questions).
Then he was going through my OA's, I told him what the prior 3 rounds were. He decided to review OA2. For my OA2, he could see my screentime for both the questions. I took 45 mins in one question and only 6 mins in the other question. So I had to justify that.
Review of 1st question: The question was a variation of Number of Islands. I had done this question in 6 mins. He asked me to walk him through the code and asked for an alternate approach using BFS.
Review of 2nd question (Fetch items to display): This was smooth. I went over the sorting and logic of the code.
After this he asked me if I have any questions for him regarding his work profile. We conversed for about 15 mins, mostly he was doing the talking. He didn't ask me any behavioural or resume related questions.

Result: After 2 days my student portal changed to "Moved to another job", and a day later, I received the offer:)