I was able to print the layout, no lines were exclued, the pattern was complete.
I created the layout by selecting the 24" roll paper in the layout paper size field. ( I try to use the smallest roll paper 24" for my layouts, and if 24" isn’t wide enough I move up to the next widest roll paper 36" and try again. And I always check the ‘ignore margins’ box.)
Then I went to File/Layout/Preview Tiled PDF. I clicked on the multi-tile icon to show the entire layout tiled across the pages.
I’m using an old Brother 7820N, with US Letter paper (not European A4). I made sure my printer is set for Letter using my laptop’s operating system (Ubuntu 17.10) printer manager. For what it’s worth , my printer is defined to have .39" margins for top, left, right, and bottom. I believe that if you ignore margins in the layout dialog, then the layout algorithm will read the margin info directly from the operating system printer driver. So I always check the ‘ignore margins’ box.