WYSIWYG 2.0 Preview Error

I really like the new WYSIWYG editor and it is already quite useful.
But i thing i found a bug considering the new wysiwyg editor. I edited a page in wiki 2.0 wysiwyg mode and pressed the preview button.
Everthing's fine and the page layout really looks like What You See Is What You Get. But after pressing the "Back to Edit" button the wiki 2.0 syntax commands are mixed up.

For example:
The wysiwyg editor produces a bold text like **test** and the preview displays test

After the "Back to Edit" the wysiwyg editor displays the asterisks instead of test and the wiki 2.0 text displays ~*~*test~*~*

Hope you got my point and know what i mean.

Regards,
Christoph