Selectable: Filtered items does not refresh

I've created a selectable as follows:

$('ul.selectable').selectable({
	filter: 'li:not(.ui-state-disabled)'
});

If I add the "ui-state-disabled" class to one of the selectees at a later time, the selectee exhibits strange behavior, like being able to be selected but not unselected, rather than being filtered completely as expected.

To work around this, I've had to do something similar to the following:

$('ul.selectable li.ui-state-disabled').each(function(){
	$.removeData(this, 'selectable-item');
	$(this).removeClass('ui-selected ui-selectee');
});

I would think refresh ought to perform this on selectees that now match the filter expression.