REST: actvityId seems to always be 'null'

Flowable Engine
1

Hello All.

Userguide has an example of GET /runtime/process-instances/{Id} call, which returns body with ‘activityId’ set to current activity:

{
   "id":"7",
   "url":"http://localhost:8182/runtime/process-instances/7",
   "businessKey":"myBusinessKey",
   "suspended":false,
   "processDefinitionUrl":"http://localhost:8182/repository/process-definitions/processOne%3A1%3A4",
   "activityId":"processTask",
   "tenantId": null
}

I have a VERY basic process (start->userTask->end) with 1 user task just started. Running GET /runtime/tasks?processInstanceId={myProcInstanceId} returns a ‘userTask’ task correctly. But GET /runtime/process-instances/{myProcInstanceId} always has ‘activityId’ nulled. I expected it will have ‘myUserTaskId’ (current activity) in it.

Am I missing something?