[NTG-context] \setuptyping[lines=yes] bug in beta?

Dear list, the following sample: \showframe \setuppapersize[S6] \setuptyping[option=TEX,lines=yes] \starttext \starttyping \startvariante[MRU]{{\em om} X}En un lugar de la Mancha, de cuyo nombre no quiero acordarme, no ha mucho tiempo que vivía un hidalgo de los de lanza en astillero, adarga antigua, rocín flaco y galgo corredor.\stopvariante[MRU] \stoptyping \stoptext gets lines broken wrong in beta from 15.10 (I have just updated the ConTeXt Suite, but I get no newer beta), but lines are broken right with MkIV in http://live.contextgarden.net. I think this may be a bug. Many thanks for your help, Pablo -- http://www.ousia.tk