Change Healthcare Software Development Test Engineer interview questions

Applied in November 2019, got a call from HR in 1st week of December 2019, discussed about my experience, why I'm interested and told about my visa status and all. Later on had a phone interview with QA manager, 30 min call was mostly about my past experience etc. Followed by Online test which had around 50 questions in 170 minutes. After 1 week, had a final video call with Lead 50% technical and 50% general QA questions. After 3 weeks got a call from HR that they are interested in moving forward but no offer letter is provided, i was happy and after 2 weeks got an update saying they are unable to proceed further. Very slow process, no timely update, their online job status portal never is never update.