[NTG-context] Wrong MetaPost text output

Dear devs, There seems to be a bug in the MetaPost integration of ConTeXt. The MWE below should produce three different labels “dummy foo bar” but instead produces “bar bar bar”. The same example works correctly in plain MetaPost. Originally reported on https://tex.stackexchange.com/questions/503773/strange-behaviour-of-the-btex... Cheers, Henri --- \starttext \startMPpage def drawtest(expr i) = %i is not used here draw btex dummy etex shifted (0,0); draw btex foo etex shifted (1.5cm,0); draw btex bar etex shifted (3cm,0); enddef; drawtest(5); \stopMPpage \stoptext