Bug? ImageMagick 6.7.0-4

[discoverer]

Version: ImageMagick 6.7.0-4 2011-06-06 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2011 ImageMagick Studio LLC
Features: OpenMP

The following simple code:
convert -size 5x5 canvas:black -draw "fill white circle 5,5 5,0" -depth 8 rc5_opacity_nw.pgm
gives a weird result.

[glennrp]

Yes, there seems to be a regression between 6.7.0-0 and 6.7.0-4

With 6.7.0-0 I see a filled quarter-circle centered at the lower right corner.
With 6.7.0-4 I see the same but just the unfilled edge.

Glenn