See if some THIN superglue will wick into the crack, if it will put THIN superglue on it/in it and let it dry over night. Come back and touch it up / Smooth it out and don't worry about it. From the cracks im seeing they are not critical.
That type of cracking is not unusal from a hole that has prolly had a limb bolt cranked down on, the pressure developed the crack that ran to the limb butt. Thin superglue will take care of it and usually will wick down into the crack, seal it and make the crack disapper.
Dave