[NTG-context] Are positional graphics still working?

I've copied the following example from the ConTeXt archive: \defineoverlay[frames][\positionoverlay{frames}] \setupbackgrounds[text][background=frames] \startMPpositiongraphic{frame} if unknown context_apos : input mp-apos.mpiv ; fi ; \MPgetposboxes{\MPvar{self}}{\MPanchorid} if nofposboxes = 1 : draw posboxes[1] ; fi ; \stopMPpositiongraphic \startpositionoverlay{frames} \setMPpositiongraphic{one}{frame} \setMPpositiongraphic{two}{frame} \stoppositionoverlay \starttext This \hpos{one}{word} should be \hpos{two}{framed}. \stoptext Frames are misplaced, so I don't know if that's a bug or something else has been updated/changed/deprecated. Thank you in advance. Jairo