When Koji runs the postBuildStateChange callback, the build info passed in is out of date, so messages sent out on the message bus contain the old state. For instance, on a build complete message, the state is still 0, and completion_time and completion_ts are None. Any application that listens to these messages and requires the up to date build info must query the Koji API for the latest information which is wasteful for the application and Koji.