Is the light line at the point of joining the Polaring disc normal?

Is the light dash in miescu joining the polaring puck normal? About a week ago I bought a new pack of 3 pucks, but I had to do a few things so it came out that with 2 hours I walked with the packaging in the bag, when it was quite cold outside, I do not know about 0 degrees. When I got home, I put the rings in the cupboard and today I had to put a new one. After leaving the package, however, I noticed one significant scratch and the other very delicate in miescu joining. This ring I considered damaged and threw, but after opening the next one I saw that he also has a light dash in miescu joining. Is this normal, and after the porstu I did not notice it with earlier discs? Could the rings have been damaged in some way by the cold? I put a new spine (the latter) but I'm stressed by this situation.