DataObject without Input/Output icon

When I write a DataObject with incoming and outgoing associations (See Screenshot_Web-Designer_before_saving.jpg), the DataObject will turned to DataInput (= with Input icon inside) after saving (See Screenshot_Web-Designer_after_saving.jpg).

To model a DataObject, I expect that it should be just a DataObject notation without Input icon according to the example figure in BPMN 2.0 spec (See Data_object_example_out_of_BPMN_v2_0_specification.pdf).