ASP.NET Cache and HtmlAnchor HRef Bug

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I just ran into a strange problem where all the links on a list are getting dropped.  The anchor tag was still there but the href was gone.  I tracked it down to a bug in the cache.

Here is the scenario.

I am building a fairly complex bullet list in code that will change very infrequently so I cache the user control for 24 hours.  The problem is anything being built with an HtmlAnchor control is losing the Href value, but not anything else.

This breaks:

var anchor = new HtmlAnchor { HRef = "http://www.juggle.com/", InnerText = "Juggle" };

This works:

var anchor = new HtmlGenericControl("a") { InnerText = "Juggle" };
anchor.Attributes.Add("href", "http://www.juggle.com/");

Now if I try to re-create the bug with a simple test, no luck.  It is some other deadly combination.  Maybe caching the entire UserControl?

Anyone else seen this bug?

This was the only thing I could find about it.

Problem with HTMLAnchor and ASP.Net Cache