Abnormal AI interview questions

Recruiter Screen, HM round, technical round, virtual onsite (3 more technical rounds). All were organized well, with timely communication after each round. Interviewers were knowledgeable and fair. Good focused questions that felt pertinent to the work, not just abstract LeetCode

The interview process was quite extensive. It began with a take-home assignment to build a file-upload application with deduplication and search functionality, which I completed and submitted. They was accepted my solution and passed me along to review round. This is where I was rejected. They asked me to describe my architectural decision and how I used AI in my design and development. The guy was impressed and then he asked me to add a feature in the take home to be able to search the content of the file? I mentioned the solution due to spending too much time in dicussion. I didn't have enough time to implement it.