PureCode Software LLM Prompt Engineer interview questions

Time waste. Completed two rounds of interview. The interviewer was living in his own world. After good second interview, the HR told me that I have skipped the "assignement" given to me in first interview. I was not given an assignment explicitly. I conveyed the same and got rejected. Wasted my time. Why did they go for an hour and half long second interview? The interviewer was a fresh graduate out of college and completed roughly 5-6 months in the company.