[NTG-context] \setupcolumnsetlines does not work

17 Aug 2019

      In an effort to balance columns in a columnset layout, I found that in the following minimal example this effect is not obtained.
After commenting out the first three lines after \starttext the result is ok.
I am wondering what I overlooked this time.

\definecolumnset[Two][n=2] 
\starttext 
   \startcolumnset[Two] 
      \input knuth 
   \stopcolumnset 
   \page
   \setupcolumnsetlines[Two][1][1][9] 
   \startcolumnset[Two] 
      \input knuth 
   \stopcolumnset 
\stoptext 

Thank you for your suggestions,

Sytse Knypstra