Following exception is raised on unDeploy:

java.lang.IllegalStateException: Runtime manager org.kie.server.testing:signalling-project:1.0.0.Final is already closed
at org.jbpm.runtime.manager.impl.SingletonRuntimeManager.getRuntimeEngine(SingletonRuntimeManager.java:191)
at org.kie.server.services.jbpm.kafka.KafkaServerExtension.onUnDeploy(KafkaServerExtension.java:251)
at org.jbpm.kie.services.impl.AbstractDeploymentService.notifyOnUnDeploy(AbstractDeploymentService.java:101)
at org.jbpm.kie.services.impl.AbstractDeploymentService.undeploy(AbstractDeploymentService.java:194)
at org.jbpm.kie.services.impl.KModuleDeploymentService.undeploy(KModuleDeploymentService.java:238)
at org.jbpm.kie.services.impl.AbstractDeploymentService.undeploy(AbstractDeploymentService.java:178)
at org.kie.server.springboot.samples.KafkaFixture.cleanup(KafkaFixture.java:134)