Mixing formatting and groups inside lists confuses wiki syntax parser / renderer

Steps to reproduce:

• create document (in xwiki/2.1 syntax)
• add content

  * ##monospace##(((separate)))
  * ##mono##((({{warning}}Note{{/warning}})))
  

• view the document

Result:
In the first list element the "monospace" text is not formatted as monospace. In the second list element, the "monospace" is not formattet, but the contents of the macro inside the group is.

Converting the content inside the edit from syntax xwiki/2.1 to xwiki/2.0 converts the content to:

* (((
monospace####separate
)))
* (((
mono##{{warning}}
Note
{{/warning}}##
)))

I guess this content is what the syntax parser "really" sees after trying to repair something.

A "real live" example where this happens: http://dev.xwiki.org/xwiki/bin/view/Community/DevelopmentPractices#HBuildBestPractices