Just had a sim age up from a teen to a young adult. No notification popped up to select a new trait so they are stuck with 2 traits still when they should have 3. Additionally, they graduated from hi...
Ideas
I figured something out today. Before I aged up my teen, I used the cheat menu to add a High School Trait (i.e. Valedictorian). This spawned a Milestone "memory" and when I had him blow out the candles... for the first time in months, I got the age up menu. Third trait, bonus traits, everything!!
I just tried it, but, unfortunately, it doesn’t work for me. However, the age up menu works in new saves.