FILTER_FLAG_HOSTNAME accepts ending hyphen #16523

Description

Hello,

The following code:

<?php

$domains = [
    'a-.bc.com',
    'a.bc-.com',
    'a.bc.com-',
];

foreach ($domains as $domain) {
    echo $domain . PHP_EOL;
    var_dump(filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME));
    echo PHP_EOL;
}

Resulted in this output:

a-.bc.com
bool(false)

a.bc-.com
bool(false)

a.bc.com-
string(9) "a.bc.com-"    // <------------ here is the bug

I expected this output instead: a.bc.com- test should return false.
I thought that the ending hyphen is not permitted on domain name (https://datatracker.ietf.org/doc/html/rfc1035#section-2.3.1).

This code is tested here : https://3v4l.org/XbMCV

This bug happens in PHP 8.1.30, PHP 8.2.24 and PHP 8.3.12

PHP Version

PHP 8.3.12

Operating System