Did you have it set up before upgrading? Wondering if that’s the key. I’m still on 18.1 RC, I have an audiogram stored, it doesn’t appear, and Custom Audio Setup doesn’t ask for one like it used to.
Honestly I wouldn't take too much what the triage person did. I've had legit bugs get closed that way and then later reports stay open and eventually fixed. It's not ideal by any means.