Manual CSS minify broken

Hi.
Apparently, W3 TC is not recognizing CSS urls with query string (like this https://fonts.googleapis.com/css?family=Mountains+of+Christmas%3Aregular%7COpen+Sans%3Aregular&subset=latin-ext) while in manual minify mode, whreas it is while in auto mode.
In other words, if the auto minify option is selected, such a css “link” tag is effectively minified and grouped, whereas, while in manual mode, W3TC generates the minifeid css with all other urls, and leaves the url with a query string untouched.
Any ideas?
Thanks