same issue here as well.
If you have a shortcode which accepts parameters as :
[tooltip tip="Some tooltipc ontent here "]Tooltip Anchor[/tooltip]
now if I call this tooltip manually at some place using:
$string='[tooltip tip="Some tooltip content here "]Tooltip Anchor[/tooltip]';
echo do_shortcode($string);
You'll see that top ends at "Some" , breaks at space...
Weird, I guess that is a bug.