convertToBpmnModel not set assignee to BpmnModel in activiti 6

[jkanjariya]

HI

I have tried to convert model Node to BpmnModel with the help of  BpmnJsonConverter().convertToBpmnModel(modelNode) method.all data set as per aspect but only assignee  is not set to modal.

I have tried this

BpmnModel model = new BpmnJsonConverter().convertToBpmnModel(modelNode);

please find model node request as attachment.

Please do needful.