Evonik Applied Technology Scientist interview questions

Recruiter invited me to apply and did initial phone interview, then vanished. A month later a second recruiter set up a phone interview with the hiring manager. The hiring manager seemed great and made it apparent that I would likely have a physical interview. The recruiter called back later that day and set up a time and day for physical interview and said that I would have to make a 20 minute presentation and she would send more details. I never got more details or heard from her again and ended up leaving a message with the hiring manager. A third recruiter confirmed the info a bit later. I went to all the trouble of making the presentation, interviewing at the facility, sending thank yous, and following up with a fourth recruiter (really), only to finally receive an automated email saying I wasn't selected for the position. This did not leave me with a good impression of Evonik. The scientists I interviewed with were all wonderful, but the rest of the company seemed like a hot mess.