Bug#980202: convert fails to create image with text

[jffry]

reassign 980202 imagemagick 8:6.9.11.57+dfsg-1
thanks
convert +matte -depth 1 -colorspace Gray -pointsize 12 -units 
PixelsPerInch -density 300 label:"The quick brown fox" test.png

used to create an image like the test-old.png attachment

In 8:6.9.11.57+dfsg-1, the same call produces an image like 
test-new.png, which is missing the text.