Thanks @KunalJain.
BTW, I found a breaking change in the schema: a job name that worked fine in version 2 produced an error in version 2.1.
I eventually tracked it down to the presence of a colon (:) in the job name. When I replaced this with an underscore (_), the errors disappeared.
This is a breaking change, so if you’re following semver, the new version should really have had a major version change.