Not using callbacks, is that obligatory? I was forced to upgrade from 5.2 to 5.3 and everything was working well until I tried to implement the swimlanes. I'm currently just registering the user and groups to the TaskService, the old approach.
as far I know, there's only one simple and mocked swimlane test in master. And it works passing the ActorId to the workitemManager on complete. Not the best scenario to test, maybe later it can be improved
regards