What am I seeing in this OMC?

I’m looking at an old mine cut, and there are these two areas that I notice at times that look like a long dark line. They do come and go, and I can’t tell if they’re slim facets, light leakage under the edges of the table, or something else. I drew arrows to what I’m referring to in the first pic with the top one dark and the bottom light. In the second pic you can see how they’re both light. Is this happening because of the cut? Thank you!