In test scenario with Kie Server and RH SSO we are working with processes and task in Kie Server. Kie Server user start a new process with usertasks.
Tasks from the process are assigned to the Kie Server user. When Kie Server user try to get task list (find tasks or find tasks as potentinal owner), empty list of tasks are returned. If we tried to get specific tasks from Kie Server (by task id), the task has set as owner Kie Server user.