Unable to create a mock response with a XOP-attachment

Hi,

I'm trying to create a mock response from my test response that contains a XOP-attachment (see original_response.jpg) (Click "Add to MockService"). SOAPUI create a mock response with an attachment, but the attachment has size 0, broken content, Part value is empty and Type is UNKNOWN (see mock_response.jpg).

Is is a bug? Are there any tricks to work with mocks and XOP attachments?

Thank you in advance,
Dmytro