It appears that if artwork is copy-pasted from an external Vector editor, that contains an orphan Path Point in the artwork (a Path Point within a PathFigure that is not part of a Segment), Studio draws a very faint line between the orphan Path Point, and the rest of the Path Figure, that doesn't exist in the original artwork.

Attached you will find:
1) OriginalVector.jpg: What the original vector artwork looks like in Adobe Illustrator. Note the absence of a white diagonal line from the "o"
2) OrphanPoint.jpg: A wireframe view of the original vector, showing the orphan Path Point.
3) LineDrawn.jpg: What Studio renders when the entire Path is imported into Studio.
4) NoesisTechnologies.ai: The file containing the orphan Path Point, to be able to repro this issue.