In a doublesided document, how can I suppress the chapter title marking in the header of the blank page that follows a chapter in which the text ends on a recto page? I do not want to suppress the header.

The following example shows the problem on pages 4 and 6. I notice that the Contents chapter does not exhibit this problem (page 2). But checking the source for completecontent provides no useful information. Indeed, when I use title instead of chapter, as done in strc-lis.mkvi, page 2 gets the marking as well!

\setuppagenumbering [alternative=doublesided,location=]
\setupheadertexts   [][{\it\getmarking[section]}]
                    [{\it\getmarking[chapter]}][]
\setupheadertexts   [margin]
                    []
                    [{\inframed[frame=off,leftframe=on,loffset=1em]
                        {\userpage}}]
                    [{\inframed[frame=off,rightframe=on,roffset=1em]
                        {\userpage}}]
                    []
\setuphead          [chapter]
                    [header=nomarking]

\startbuffer[testt]
    \startchapter[title=Chapter]
        \startparagraph
            \input ward
        \stopparagraph
        \dorecurse{\numexpr2*\recurselevel\relax}
            {\startsection[title=Section]
                \startparagraph
                    \input ward
                \stopparagraph
                \stopsection}
    \stopchapter
\stopbuffer

\starttext
\completecontent
\dorecurse{3}{\getbuffer[testt]}
\startchapter[title={Chapter Last}]
    \input knuth
\stopchapter
\stoptext

--
Rik