As the new leaves go through their embryo and very early development they are very soft and fragile, and are frequently folded up along the main rib so that what ends up far apart actually started out close together. In the Ficus family the very young leaves are protected by a sheath; this can be a good and bad thing, since on the one hand it protects, but if the growth undergoes a spurt the emerging leaf can be mechanically constrained inside its protective covering. Soft tissues can be damaged due to compression and sudden release.
It might be instructive to watch your emerging leaves to see whether in their early stages they are free to expand. It just takes a bend or a crease at the single leaf margin while very young to present itself as nicks and dents on both margins once fully spread and mature. Nothing to be done, the leaf will soon be gone once its task is completed.