Problem with bold codification when switching from wiki editor to wysiwyg, disabling bold and swithing again to wiki

Here's how to reproduce:

• Create a document in wiki mode with the following inside:

  Hello *world*
  

• Switch to WYSIWYG mode
• Select the bold "world" word and click on the bold icon to remove the bold
• Switch back to wiki mode. You'll see the following:

Hello {style:type=span|class=bold}world{style}

This is wrong as it should show:

Hello world