Aren't you glad though. That was very quick way to learn about the company. And you have an awesome story to tell.

Same kind of thing happened when I interviewing for AWS. Forgot to call for phone screen. Manager didn't show up on day of interview. Forgot about me during lunch. Had to parrot back the leadership principles while doing even sillier whiteboard puzzles. Then "we'll call you next day" as I had a few offers in hand was more like 2 weeks later.