site:run in maven's site/trunk doesn't show certain apt files

Pull down https://svn.apache.org/repos/asf/maven/site/trunk at revision 612559 and do mvn site:run. Now examine http://localhost:8080/guides/introduction/introduction-to-dependency-mechanism.html

You'll get a 404 error. But the apt file is clearly there, and it works fine if you "mvn site" and then navigate to target/site/guides/introduction/introduction-to-dependency-mechanism.html.