The functionality for adding endpoints in rewrite rules does not work for attachments.
In wp-includes/rewrite.php:
//do endpoints for attachments
if ($endpoint) { foreach ($ep_query_append as $regex => $ep) {
if ($ep[0] & EP_ATTACHMENT) {
$rewrite[$sub1 . $regex] = $subquery . '?' . $ep[1] . $this->preg_index(2);
$rewrite[$sub2 . $regex] = $subquery . '?' . $ep[1] . $this->preg_index(2);
}
} }
should be:
//do endpoints for attachments
if ($endpoints) { foreach ($ep_query_append as $regex => $ep) {
if ($ep[0] & EP_ATTACHMENT) {
$rewrite[$sub1 . $regex] = $subquery . $ep[1] . $this->preg_index(2);
$rewrite[$sub2 . $regex] = $subquery . $ep[1] . $this->preg_index(2);
}
} }
Note the typing error in $endpoints, and the '?' is already present in $subquery.
