HR call plus 1 completed technical round; second round rescheduled repeatedly then dropped

Application

I applied online. I interviewed at Zomato (Gurgaon, Haryana) in Nov 2019

Interview

I have applied online for it. I got a call from HR, she asked about my experience, compensation, etc with some technical questions. Then after a week she called and setup an technical interview with some person from development team. Interview was good and after the interview she called with the positive feedback and said will schedule another technical interview. Next day she said the person is not available, lets shift it to the coming week. I have never got a callback since then.

Interview questions [1]

Question 1

Questions were like classes vs struct, how classes are maintained internally(the data structure), dynamic dispatch, ARC, Reference cycle, etc