Codex returns 500 error when WordPress cookies are set

Since March 14th Codex is sometimes returning a 500 error. It seems like this only happens if the wporg_logged_in cookie is set.

➜  ~ curl -v --cookie "wporg_logged_in=fooo%7C123456789%7C25ce9fd05b1aewf00509d6g5a602ae23" "https://codex.wordpress.org/index.php?title=Special:UserLogin&returnto=Help%3AContents"
*   Trying 66.155.40.241...
* TCP_NODELAY set
* Connected to codex.wordpress.org (66.155.40.241) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
* Server certificate: *.wordpress.org
* Server certificate: Go Daddy Secure Certificate Authority - G2
* Server certificate: Go Daddy Root Certificate Authority - G2
> GET /index.php?title=Special:UserLogin&returnto=Help%3AContents HTTP/1.1
> Host: codex.wordpress.org
> User-Agent: curl/7.51.0
> Accept: */*
> Cookie: wporg_logged_in=fooo%7C123456789%7C25ce9fd05b1aewf00509d6g5a602ae23
>
< HTTP/1.1 500 MediaWiki exception
< Server: nginx
< Date: Fri, 17 Mar 2017 10:40:10 GMT
< Content-Type: text/html; charset=utf-8
< Transfer-Encoding: chunked
< Connection: keep-alive
< X-Content-Type-Options: nosniff
< Strict-Transport-Security: max-age=31536000
<
<div style="border:1px solid #ffd0d0;padding:1em;">This is a cached copy of the requested page, and may not be up to date.</div><hr /><h1>Sorry! This site is experiencing technical difficulties.</h1><p>Try waiting a few minutes and reloading.</p><p><small>(Cannot contact the database server)</small></p><hr /><div style="margin: 1.5em">You can try searching via Google in the meantime.<br />
<small>Note that their indexes of our content may be out of date.</small>
</div>
<form method="get" action="//www.google.com/search" id="googlesearch">
	<input type="hidden" name="domains" value="http://codex.wordpress.org" />
	<input type="hidden" name="num" value="50" />
	<input type="hidden" name="ie" value="UTF-8" />
	<input type="hidden" name="oe" value="UTF-8" />

	<input type="text" name="q" size="31" maxlength="255" value="" />
	<input type="submit" name="btnG" value="Search" />
	<p>
		<label><input type="radio" name="sitesearch" value="http://codex.wordpress.org" checked="checked" />Codex</label>
		<label><input type="radio" name="sitesearch" value="" />WWW</label>
	</p>
* Curl_http_done: called premature == 0
* Connection #0 to host codex.wordpress.org left intact
</form></body></html>

#prio1

#ffd0d0