Faulty repeated insertion of class="wikiinternallink" by WYSIWYG editing

This behavior is similiar to XRENDERING-600 ("wikiattachmentlink" was duplicated)

If you create a wiki link - using the Wiki-Editor - like

[[(% style="background-color:black; color:white" %) John Doe >>path:mailto:john.doe@nowhere.org]]

with style attributes within the link text, this will be rendered to HTML like

   <span class="wikiinternallink">
     <a href="mailto:john.doe@nowhere.org">
       <span style="background-color:black; color:white"> John Doe </span>
     </a>
   </span>

The problem is that the WYSIWYG-Editor/Rendering taskl will write the following source back to the document during save operation with adding a class specification.

[[(% class="wikiinternallink" style="background-color:black; color:white" %) John Doe >>path:mailto:john.doe@nowhere.org]]

But: The class name "wikiinternallink" will be added every time  to the link the WYSIWYG editor is used with save - resulting in

[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink .........

 When a document has > 1000 additional class attributes browser sometimes get problems.

Last tested with version 13.10.4