Interesting. My first guess would be since this part was created originally with both copper0 and copper1 to satisfy the need to have a copy for each side and then changed to only have copper1 it may be allowing this to happen despite not having one within the other. The copper logo thing is actually just an SMD single pin part so the rules that apply to it must apply to these as well.
My second guess is maybe it just mirrors the individual pads and since these pads are rectangles it doesn’t matter. But if the pad was non-symmetrical it would show up. I say this because the copper logo thing was in essence just a single pad that got mirrored.