Unless there are matching marks in the converter housing, those are manufacturing defects.
As I understand it, and from what I have seen, these plates are laser cut. Poor laser parameter setup will burn the metal at the end of a notch cut. I've done it myself on some of my own parts.
I also doubt they have any significant impact on the clutch performance.
On Edit:
I just re-examined the first picture. The sample on the right looks punch cut/notched, not laser. I can't tell from the second picture. Bad notching operation cleaned up with a grinder?