Michael I had the same problem on my last roll. I'm not sure if it's the case but on that roll I remember I actioned the wind lever with too much energy on the last frame, and I could notice how that made the sprockets slip and jump between film sprocket holes (no good!). From there it's very possible that my film moved slightly inside the canonet film pressure 'tongue', leading to scratches similar to yours.
Check if one or more of the sprocket holes on your film is damaged or bent, that could be an evidence...