[NTG-context] how to set overprint

Hello, whatever I try, I cannot get the overprinting right (checked in Output Preview of Acrobat). Even overprint-001.tex from the test suite (2020-09-19) doesn't seem to have it right (latest beta). What I'm missing here? \setupcolors[intent=overprint] \startTEXpage[offset=10mm] \framed[frame=on,offset=10mm, background=color,backgroundcolor=darkgreen]{ % \startcolorintent[overprint] \startoverprint text in black \stopoverprint % \stopcolorintent } \stopTEXpage Thank you, Jano