[NTG-context] vertical distance in combinations

Hi, the following code does not work in mkiv (also tested with latest beta). \setuppagenumber[state=stop] \starttext \setupcombinations[distance=10mm,inbetween=\vskip10mm] %\setupcombinations[distance=10mm,inbetween={\blank[10mm]}] \setupblackrules[width=40mm,height=40mm] \startcombination[2*2] {\blackrule}{} {\blackrule}{} {\blackrule}{} {\blackrule}{} \stopcombination \stoptext Peter