[NTG-context] header/footer suppression

I can't get both a blank page inserted whenever a chapter finishes on an odd page and also suppress my header on the first page of a chapter. Here's my minimal example: ----- % output=pdftex \starttext \setuphead [chapter] [before={\page\ifodd\realpageno\else\page[empty]\fi\page[right]}, header=empty] \setupheadertexts [chapter] \setuppagenumbering[alternative=doublesided, option=doublesided] \chapter {test} \dorecurse{10}{\input tufte } \chapter {test} \dorecurse{10}{\input tufte } \chapter {test} \dorecurse{10}{\input tufte } \stoptext -----