[FIXED] [GRO] Milestones reset for uncontrolled sim who is visited/invited etc.

I just had this happen in my save file too. My family had two kids, and each got all of the infant, toddler, and child milestones as they grew up. The oldest child graduated high school and went off to university. I had decided to have him stay in the dorms, so he moved out. Once he finished uni, I went back to the main house to get his little sister through high school, and found that she had lost all of her infant, toddler, and childhood milestones aside from beginning puberty and making best friends. The lost milestones included ones as a teen too, such as reaching the top of an after school activity, getting prom royalty, and childhood phases. Her brother did come visit the house while he was away at uni a couple of times, so not sure if that has anything to do with the lost milestones.