CKEditor does not save style of formatted content after saving or switching to source code of page

Step to reproduce

1. Navigate into dedicated page or any Sandbox test pages
2. Edit the page in your XWiki by CKEditor and type simple sentence

   text text text
   

3. Select this line and change text from Normal into Formatted (note that after this the line will be wrapped into blue transparent box)
4. Make one of the word bold/italic (do not save changes)
5. Observe applied style
6. Save changes or swtich to source of this page from CKEditor toolbar menu

Actual result

The word that was bold won't have bold syntax.

{{{text text text}}}

Expected result

The bold syntax is saved for preformatted text.

{{{text **text** text}}}