bug - extra em tags inserted

HTML 
<EM>Susan Vance<FONT size=3></EM>
<p>nomad</p>

tidy cleans it up as
<em>Susan Vance</em>
<p><em>nomad</em></p>

The cleaned up code has nomad in italics

while it should have been cleaned as
<em>Susan Vance</em>
<p>nomad</p>

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