Hatch z-index problem in pdf print on mac

Hello all,

I am having two overlapping solid hatches in the same plane. I order the z-index of these hatches with ‘Send to Back’ and ‘Bring to Front’. On the screen this seems to work fine. However, when I print to pdf the z-index order sometimes is sometimes wrong.

I work around this by cutting out the top hatch area from the bottom hatch. However, when the position of the top hatch changes, i have to recut the bottom hatch every time. I could also move the hatch with the move command on top of the other but I rather have this working properly.

Is this a bug or am I doing something wrong?

Appreciate any help!