CMMN job handler not registered in flowable UI 6.8?

Dear community,

I’m currently running Flowable UI 6.8 (default Docker image). When one of the tasks needs to be retried, the instance gets stuck with an ‘executable job’. When I force the execution of this job, I get the following error:

org.flowable.common.engine.api.FlowableException: No job handler registered for type async-continuation in job config for engine: cmmn

When running an instance of Flowable UI 6.7(.2) I don’t have this issue. Looking into the configuration, this seems to be the same for both instances. So my question is, what could be the cause of the issue in the 6.8 instance.

Thanks in advance