I'm seeing the same thing. I wonder if it's related to the new submission system. It changed recently to allow multiple submissions at the same time. This was the first build using this new system that is missing dsyms.

Has anyone using fastlane match been able to resolve this issue? We just recreated our distribution cert/profile a month ago and it has worked for several app submission up until today. Recreating the cert/profile in Xcode isn't a (long term) solution for us.