those arent cracks
rather imperfections on the wood, in area that otherwise cannot be sealed and it would make it difiicult to guaranteet hose nots not to fall out of weak sections in the wood figure
i recomend taking a dremmel, and dremel,ing out what u dont like, and then using a high desity wood filler and push it in, kneading it....then try and match the wood with stains in parts, use a q tip and dissolved stain, highly disolved
this happns all the time on these bodies, usually if it a gibson, they use epoxy that is color matched with pigment like color matching paint
lways happend!!