Dom4JWriter.addAttribute work incorrect

Dom4JWriter.addAttribute work incorrect, see attached test case.

I want:

<?xml version="1.0" encoding="UTF-8"?>
<root>
<A attrA="valA"/>
<B attrB="valB"/>
<C attrC="valC"/>
</root>

but with code:

StringWriter stringWriter = new StringWriter();
XMLWriter writer = new XMLWriter(stringWriter);
Dom4JWriter dom4JWriter = new Dom4JWriter(writer);

dom4JWriter.startNode("root");

dom4JWriter.startNode("A");
dom4JWriter.addAttribute("attrA", "valA");
dom4JWriter.endNode();

dom4JWriter.startNode("B");
dom4JWriter.addAttribute("attrB", "valB");
dom4JWriter.endNode();

dom4JWriter.startNode("C");
dom4JWriter.addAttribute("attrC", "valC");
dom4JWriter.endNode();

dom4JWriter.endNode();

I get:

<?xml version="1.0" encoding="UTF-8"?>
<root>
<A attrA="valA"/>
<B attrA="valA" attrB="valB"/>
<C attrA="valA" attrB="valB" attrC="valC"/>
</root>

I assume that "attributes.clear();" is necessary in Dom4JWriter.endNode() after "writer.write(element);" for correct working.