Not a perfect solution but hide this way.
write this to your theme, functions.php
add_filter( ‘login_errors’, function( $errors ){
if (strpos($errors, ‘Captcha’) !== false) {
?>
<style type=”text/css”>
#login_error{
display: none !important;
}
</style>
<?php
return ”;
}else{
return $errors;
}
}
);
