Apple Machine Learning Engineer interview questions

I gave two interviews: one was a technical round, and the second was an HM, which I blew up because no one told me what it was about. I messed up the what is your challenging work question because I was just giving my last week's challenging part at the time. First Interview covered all the basics of my past projects and second interview is kind of a behavioral and technical project deep dive. Also, I despise it when they type in interviews constantly; I assume they were providing feedback during the interview. The recruiting doesn't reply if you are rejected. I got ghosted now.