[NTG-context] textbackground and protrusion

Hi! Currently (Context beta 2010-06-20 / Luatex 0.60.1), textbackground and protrusion don't work together. Here's a little test file: --------------- \showframe \definefontfeature[test][mode=node,script=latn,kern=yes,trep=yes,tlig=yes,protrusion=quality] \definetextbackground[MyTextbackground][frame=off] \enableprotruding \starttext \definedfont[lmroman12-regular*test] "An arbitrary and \startMyTextbackground incomplete \stopMyTextbackground\ sentence." \stoptext --------------- Is there a workaround for this? Thanks in advance.