Iteration through the HtmlDocument.All collection stops at the referenced stylesheet?

Since "bug in .NET" is often not the real cause of a problem, I wonder if I'm missing something here.

What I'm doing feels pretty simple. I'm iterating through the elements in a HtmlDocument called doc like this:

System.Diagnostics.Debug.WriteLine("*** " + doc.Url + " ***");
foreach (HtmlElement field in doc.All)
    System.Diagnostics.Debug.WriteLine(string.Format("Tag = {0}, ID = {1} ", field.TagName, field.Id));

I then discovered the debug window output was this:

Tag = !, ID =  
Tag = HTML, ID =  
Tag = HEAD, ID =  
Tag = TITLE, ID =  
Tag = LINK, ID =

... when the actual HTML document looks like this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
    <head>
        <title>Protocol</title>
        <link rel="Stylesheet" type="text/css" media="all" href="ProtocolStyle.css">
    </head>
    <body onselectstart="return false">
        <table>
            <!-- Misc. table elements and cell values -->
        </table>
    </body>
</html>

Commenting out the LINK tag solves the issue for me, and the document is completely parsed. The ProtocolStyle.css file exist on disk and is loaded properly, if that would matter. Is this a bug in .NET 3.5 SP1, or what? For being such a web-oriented framework, I find it hard to believe there would be such a major bug in it.

Update: By the way, this iteration was done in the WebBrowser control's Navigated event.

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Iteration through the HtmlDocument.All collection stops at the referenced stylesheet?

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