This works fine for me when i test it. I did edit your code as you had a small error in the function name not matching.
Also, you might want to add a conditional tag and wrap the shortcode in a div but otherwise it works.
function adt_abovetitle($title){
//Return new title if called inside loop
if ( in_the_loop() && is_singular('post') ) {
$x = do_shortcode('[shortcode id="'. $id . '"]');
return $x . $title;
} else {
//Else return regular
return $title;
}
}
add_filter( 'the_title', 'adt_abovetitle');
You might want to test your else statement as well.
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