simplest post data looses some values in POST array

[ophian]

Description

The following scenario

I have a POST comment form field with name, email, url, replyTo, comment, and additional Captcha + 2 checkboxes, 2 hidden inputs, and the submit button. No more than 11 values to send.
Recently, I noticed that the POST data is incomplete and always missing the name and email values, even though they were definitely sent individually or as a pair.
Neither PHP global $_POST nor the internally used $serendipity[‘POST’] show these two values set.
They are also not in $_COOKIE. BUT they are present in $_REQUEST[‘serendipity’]. A previous output of $rawdata = file_get_contents(‘php://input’); shows them as given.

I have been testing PHP 8.5 since the summer, but as I can now see, I have the same phenomenon on PHP 8.4 (.13/.15) as well.
The whole thing is on my local development server with Apache SAPI (TS).
I recently had to switch to WIN 11 and have been aware of this behavior since then. Can this play a role?

I have reviewed all my commits in this regard to see if I accidentally reset POST data name and email somewhere, but could not find anything.
I have read “Apache: Fixed bug GH-9949 (Partial content on incomplete POST request)” from PHP 8.2.1 as well as https://stackoverflow.com/questions/5077969/ php-some-post-values-missing-but-are-present-in-php-input. The result remains the same.

I cannot determine where this content loss is coming from.
How can they be present in the REQUEST if they are not in GET, POST, or COOKIE?

At this point, I can only assume that somewhere during the internal PHP transfer from ‘php://input’ to the global POST array, the two get lost. It remains a mystery for me why only these two values.

Tested with

Array
(
    [url] => http://example.org
    [comment] => <p>test test with raw post data to POST
    [name] => nuschel
    [email] => nu@example.org
    [subscribe] => on
    [parent_id] => 0)

for manually filled fields, as well as
Array

(
    [entry_id] => 10
    [name] => 
    [email] => 
    [url] => http://example.org
    [replyTo] => 0
    [comment] => <p>test with full house and Notify me when these comments are updated</p>
    [token] => d3fac723205aad2a
    [captcha] => 37t
    [subscribe] => on
    [submit] => Submit comment)

for the entire POST Array (which shows them nuked)

My current workaround is

    if (!empty($serendipity['POST']['submit']) && !isset($_REQUEST['serendipity']['csuccess'])) {
        $comment['url']       = $serendipity['POST']['url'];
        $comment['comment']   = trim((string)$serendipity['POST']['comment']);
        $comment['name']      = $serendipity['POST']['name'] ?? $_REQUEST['serendipity']['name']; // simplest approach to register incomplete POST requests for name
        $comment['email']     = $serendipity['POST']['email'] ?? $_REQUEST['serendipity']['email']; // simplest approach to register incomplete POST requests for email
        $comment['subscribe'] = $serendipity['POST']['subscribe'] ?? null;
        $comment['parent_id'] = $serendipity['POST']['replyTo'];
…
print_r($comment); die();

which gives the first array output above.
This works ... but is dirty.

Can someone please shed some light on this ?? !!

Thank you

PHP Version

PHP 5 and PHP 4 latest versions

Operating System

No response

[ophian]

Sorry for the mystery noise.
I finally found the issue. It was an at least twenty years old plugin code resetting these POST vars and so an event_hook was run before the routing.

Please delete by maintainers.