Dad Disappeared After Getting Mom Pregnant--Baby Lists No Father in Geneology

My sim, Alexia, recently got pregnant with the hermit in the woods from the "Outdoor Retreat" Game Pack's baby. As soon as Alexia had the "eating for two" bubble on the bottom, the hermit walked through the all, and faded away.... Now, he isn't listed under any of my sims relationship panels, and when scrolling through my notifications, I see that where it should list his name it now lists "_____". When the baby was born, it popped up saying "Alexia had a baby!" in the center, and the notification on the right said "Alexia and ____ had a baby!" Under the baby's genealogy, it doesn't list that she has a father... It only lists the mother.

Has anyone else had this or a similar problem? Is there any known solution?

Thanks!