Question
Placed PDF in Illustrator has gaps in lines where they intersect with rectangles
I have a diagram that I made in a PDF file, which I'm trying to place using Illustrator to make a multi-pane figure for a scientific publication. However, some of the lines that are drawn in the original PDF file have breaks in them once I've placed them using Illustrator.
Here's a zoomed view part of the PDF before placing:

And here it is after being placed:

How can I avoid this problem?