Section editiong with section=1 discards content at the begining of the document

Consider a document like this one:

#set($myobj = $doc.getObject("Some.Class"))
1 Page title
$myobj.get("property")

The section editing code assigns a section number to the content between two consecutive headings or the last heading and EOF. This way, section=1 refers to the content below the document title.

The problem is that when saving the first section, everything above the document title disappears.