Description:
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Even if I'm runing smarty I think the following issue is clearly php-related.

For mod_rewrite-reasons I need absolute url here so although having trans-sid enabled I have to append the SID myself:
it looks as if php tries to add the sessionid in just one case (not every time the same one) despite of having an absolute url.

if I add an any masked entity like   the extra &PHPSESSID=dissapears.

Reproduce code:
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//smarty initialisation in an include
if(empty($_COOKIE[CCNAME])) $this->assign("sessionstring","?".SID);
$this->assign("servername",$_SERVER["SERVER_NAME"]);
//in the template
{foreach from=$nav_produkte item=menupunkt}
<a href="http://{$servername}/produkte/{$menupunkt.urlname}.html{$sessionstring}">{$menupunkt.displayname|default:$menupunkt.urlname}</a><br>
{/foreach}

Expected result:
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<a href="http://myhost.local/produkte/indien.html?PHPSESSID=ep0od8amd17te5132usq3f0l73">Indien</a><br>
<a href="http://myhost.local/produkte/thailand.html?PHPSESSID=ep0od8amd17te5132usq3f0l73">Thailand</a><br>
<a href="http://myhost.local/produkte/china.html?PHPSESSID=ep0od8amd17te5132usq3f0l73">China</a>

Actual result:
--------------
href="http://myhost.local/produkte/indien.html?PHPSESSID=ep0od8amd17te5132usq3f0l73">Indien</a><br>
<a href="http://myhost.local/produkte/thailand.html?PHPSESSID=ep0od8amd17te5132usq3f0l73"&PHPSESSID=ep0od8amd17te5132usq3f0l73>Thailand</a><br>
<a href="http://myhost.local/produkte/china.html?PHPSESSID=ep0od8amd17te5132usq3f0l73">Astro</a><br>k23bn50u6">China</a><br>

//because smarty-side $sessionstring being "?PHPSESSID=.+" it looks like a clear php-misbehaviour