Centene Business Analyst interview questions

I applied on Centene's website on 10/15 after seeing a Centene recruiter post jobs on LinkedIn. I interviewed with the same recruiter on 10/24. I had an interview with the Director on 11/4. My third interview with another manager was 11/15. I received my offer letter on 12/1. Centene sent follow-up emails after every step. The process was seamless.

GOOD? Well… 1st interview with HR -went well, 2nd interview with panel- went well, 3rd interview with SME. 3rd interview was a NO SHOW by company - waited patiently for 30 minutes - ONLY TO THEN BE REJECTED. VERY UNPROFESSIONAL.