[NTG-context] ConTeXt-defined colours broken in TikZ in MkIV with latest betas

Hi, The following example works in MkII and it works in TeX Live 2014, but it fails with the latest beta (it draws a black rectangle instead of using the defined colour): \usemodule[tikz] \starttext \definecolor[mycol][r=0.9,g=0.8,b=0.8] \starttikzpicture \fill[mycol] (0, 0) rectangle (2,4); \stoptikzpicture \stoptext It would be really nice to fix this in time for TeX Live 2015. Thank you, Mojca