Raytrace shadow from brush objects?

Hello there,

I’m playing with raytracing and I noticed That I don’t have any raytrace shadow with brush objects. Here on the screenshot the comparison between brush box and mesh box. Wtf?

If I uncheck cast raytrace shadow in the direct light, it shows a shadow, but not raytraced of course.
Is there a tweak to make it to cast raytrace shadow?

Thank you

oh it’s not supported at all by raytracing :frowning: