URL as plain text won't display TARGET=_blank attribute in a view slideshow.

I'm trying to implement a custom Views Slideshow block, linking the URL (and his attribute) with the image. Some of these images should have an URL with target=_blank attribute.

I've enabled URL as plain text in my view and rewrite the output of the field like this:
<a href="[field_url]" target="[field_url-attributes]">[field_myimage]</a>

But the field url attribute doesn't result anything, neither when I check "Allow user to choose LinkTarget" and "Open in a new window" options.

If I choose Title as link (default) the target=_blank work as usually, but I can't link the image.

Is this a bug?