[xml] Entity substitution problem with XInclude

The attached files demonstrate a problem I've having with libxml2 (tested with 2.6.9 and 2.6.10). I am using xmlParseFile with xmlSubstituteEntitiesDefault set to 1.

Using xmllint on these files does not generate a problem. Using my code, if I load test2.xml, everything works fine. However, if I load test.xml, which XIncludes test2.xml, then the LFS entity reference inside the base attribute in test2.xml is substituted, but instead an XML_ENTITY_NODE is returned in the DOM tree. Since my code is not expecting any entity nodes, it crashes :-)

Can anyone tell me what I'm doing to cause this behavior? This problem did not occur before the files were converted to use XInclude, so somehow that is affecting entity substitution.
<?xml version="1.0" encoding="iso-8859-1"?>
<!ENTITY LFS "/mnt/lfs">
<!ENTITY LFS-version "CVS-20040524">
<!ENTITY packages_dir "/tools/packages-&LFS-version;">
<!ENTITY build_dir "/tools/build">
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE alfs SYSTEM "ALFS-3.1.dtd" [
<!ENTITY % general_entities SYSTEM "general.ent">


<stage name="Creating tools directory.">
        <mkdir base="&LFS;">
<?xml version="1.0" encoding="iso-8859-1"?>
<alfs version="3.1" xmlns:xi="http://www.w3.org/2001/XInclude";>

<stage name="Chapter 5 - Constructing a temporary system">
        <xi:include href="test2.xml" />

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