The scratch is allowing the carbon to settle in the groove shruggy
I use file to fit ring sets in all the motors I build (1000s+) and I use a small hand sharpening stone to deburr the ends of the rings on all four sides and now and then I still will see some of those lines in the cylinder walls while assembling them rant When I do I make sure there are no sharp corners with burrs in those rings scope
Those scratches will stay in the cylinder walls for a while, if it does not use oil and it has a good compression test or and leak down test then run it scope up

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)