I cannot reproduce - please attach a 1-question sample survey and detail what params you are passing. Thank you.

I have attached a sample survey where it works and where it does not. I set these up on demo.limesurvey.org. The .lss files are actually the same survey, and the only difference is the automatic loading of End URL setting.

Here is how I called the survey in order to take it:
http://demo.limesurvey.org/index.php/958274/lang-en?id=42

Then, in the notworking .lss file, here is the result when I finished (I'm adding spaces to HTML so it won't render it in this report):
< a href='http://www.limesurvey.org?code=&lt; span style='background-color: #eee8aa;' >< span title='Undefined variable' style='border-style: solid; border-width: 2px; border-color: red;' >< span title='Undefined variable' style='color: red; font-weight: bold' >PASSTHRU< /span >< /span > : < span title='Undefined variable' style='border-style: solid; border-width: 2px; border-color: red;' >< span title='Undefined variable' style='color: red; font-weight: bold' >id< /span >< /span >< /span >'>Click here< /a >
< br />< br />

If I change the automatic loading setting, then I get redirected to this URL, which is correct:
http://www.limesurvey.org/?code=43

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&amp;id=12588

2.00+ Build 130708 released.

Fix committed to 2.05 branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&amp;id=12761