Can't remove styles when wrap is used?

[mrmachine]

var stylesJSON = [
    {
        btnName: 'superscript',
        wrap: 'sup'
    }
];
$('#redactor').redactor({
    plugins: ['styles'],
    stylesJson: stylesJSON
});

Clicking Remove style does nothing, and the style can be applied multiple times.

[Seanom]

I'm experiencing the same issue, the remove class appears to remove the outer class. but not the inner classes

After applying a couple of styles, in this case buttons the remove style only appears to remove the text-align: center

   <p style="text-align: center;">
    <a href="#"><span class="btn btn-alternative"><span class="btn btn-default">Button</span></span></a>
   </p>