WordPress MCE enable hidden buttons not work

I have problem, before month i use this code

function enable_more_buttons($buttons) {
$buttons[] = 'fontselect';
$buttons[] = 'fontsizeselect';
$buttons[] = 'backcolor';
$buttons[] = 'sup';
$buttons[] = 'sub';

return $buttons;
}
add_filter("mce_buttons_3", "enable_more_buttons");

and all work perfectly, but at this moment i not see these buttons on visual editor i read wordpress documentation and see this “As of WordPress 3.9 and TinyMCE 4.0 sup has been renamed to superscript and sub has been renamed to subscript. ” I make this changes on my code but problem is same, function not add buttons to visual editors. I try this on 3 wordpress blogs, and no efect. Any ideas ?