So this is a little weird. I have this:
But one object ends here… As you can see, it has no stroke… as is apparent in the image above.
However, here’s what the GFUI shows…
As you can see, it’s showing an actual line where the object ends. Only that one line. So the other 3 sides of the object’s bounds showing nothing, as is correct.
Additional: Just for fun I hit “PRINT” and the line does not appear in the preview window. But I really don’t want to waste an entire sheet of Proofgrade.