Type 6 shadings with edge connections do not render properly. The problem specifically seems to affect shadings where a coordinate is shared 3 times. The same bug affects poppler and has been reported at the following link, along with an attachment which demonstrates the problem: https://bugs.freedesktop.org/show_bug.cgi?id=84465 The first and second pages should appear identical, but the shared edge flags used in the object on the second page cause the shading to be incorrectly displayed.