I have created a pattern in Illustrator, but when I am in photoshop trying to make a mockup of that pattern as wallpaper, it shows a hairline edge at the same spot as the tile edge in Illustrator's pattern editor. In photoshop, I used 'file>place linked' to place the smart object. In illustrator, the smart object file doesn't show any hairline edges, so I'm not sure why they show in Photoshop. Any ideas?