If the fiberglass is not pulling away from the limbs , then it is probably safe to shoot. If you are worried you can take some 1/16" bo-tuff or wood laminate and epoxy over that length of limb with 5 minute epoxy, sand at a bevel on the ends to blend in smoothly with the rest of the limb and you have just customized your bow. Since this is on this part of the limb, it should not change anything on the performance. Make sure you sand the limb where the overlay will be added. When you get it good and smooth to suit you, get you some spray on finish that will blend with the rest of the bow and you are done. Or you can lightly sand the entire bow and spray it all.