K/P interview questions

I received an email from the hiring manager. We had a phone call, which went well. I received a callback for a group interview. This also seemed to go well. We exchanged a few emails after the interview, leading me to believe they were still interested in me. After promising to follow up, they disappeared. Very disappointed to be ghosted. It's fine if I'm not a fit - just please, give me the courtesy of letting me know you chose another candidate.