Isolated node is not notified by EOS (when EOS leader is on different node)

Given EOS and cluster-singleton-service are used and shard-leader for EOS is located on one cluster node and service-owner (elected by cluster-singleton-service) is on another cluster node.

When node of service-owner is isolated then there is no notification sent from cluster-singleton-service to service-owner. Result is: service-owner remains active until cluster heal. When isolated node rejoins the cluster then the notification arrives and service is stopped. But this should have happened right after isolation step.