Yes, you right. There is a bug. But code should be like that:
HTML Code:
<if condition="!$vbulletin->products['spoiler']['active']"><script type="text/javascript" src="clientscript/jquery_load.js" ></script></if>
<if condition="!$vbulletin->products['lsearch']['active']">
<script type="text/javascript" src="$vboptions[bburl]/clientscript/yui/get/get-min.js" ></script></if>
<link rel="stylesheet" type="text/css" href="clientscript/vbulletin_css/cui.css" >