[1.2.6] IE6 bug with "+" selector

[1.2.6] IE6 bug with "+" selector

I found a bug on jQuery 1.2.6 that has been fixed on 1.3.*
It's about using "plus" in selector but I don't know if is useful to create a ticket...
Here the bug:
XML:
<books>
    <book>
        <id value="11"/>
        <author value="follet"/>
        <title value="Pillars of the earth" />
    </book>
    <book>
        <id value="1111"/>
        <author value="follet"/>
        <title value="Pillars of the earth" />
    </book>   
</books>   
<br clear="all">
JS:
$.get("test.xml", function(xml) {
    xml = $(xml);
    alert(xml.find("id[value=11] + author").length);
    //firefox echoes 1 (ken follet object) but IE6 give me "properties or methods aren't supported by this object" (english translation from italian error)
});
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