[Writer] Missing image links

I have created a document into LO Writer with linked images (hosted into web and local machine) and saved it as RTF. No problem.
I kept open the doc and called this since my application and show the images as expected.
The link ‘disappear’ from the document after I close it.

What`s my error? Or its a bug?

[Writer, Rtf files, Win 7]

Duplicate of this question.

Any idea? Is it a bug with this LO version?