[NTG-context] extensibles not rendered

Dear list, thank you for the excellent Math in ConTeXt documentation! Some extensibles are not properly rendered in some viewers after the most recent update. The code below produces a pdf with only a few visible artifacts in Acrobat Reader. E.g. Safari or Preview render them correctly. If I remember correctly extensibles were properly rendered in Acrobat Reader before the update. Best wishes, Jacob \setupbodyfont[8pt] \startTEXpage[offset=none] $\overbracket{\hbox to 1cm{}}$ \blank $\fenced[brace]{\vbox to 1cm{}}$ \stopTEXpage