Quanergy Solutions interview questions

Quite a disappointing interview process and negative experience overall. I have first discussed the role via teams, then, second interview, with someone who has confirmed me, during the interview / discussions, that I have completely convinced him and that I am already selected for the third stage / interview. Then I had the third interview confirmed / already in my calendar (straight away), and just 4 hours later (I promise) I was told that the interview has been cancelled as they have chosen another candidate. Very unprofessional, disrespectful and not correct way of doing ..

Initial HR phone interview asks questions to check if skill set meet the requirements. Then, technical interview with 6 interviewers involves C++ programming questions and previous projects. Lastly, talk with CEO.