Two bonus traits instead of one if switching aspiration when growing up

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.91.186.1030
What expansions, game packs, and stuff packs do you have installed? Everything released up to and including High School Years
Steps: How can we find the bug ourselves? Have a teen sim with a non-teen aspiration. Make not of their aspiration trait (Domestic, Muser, etc). Have the teen age up and pick a different aspiration. Young adult now has two bonus aspirations.
What happens when the bug occurs? Teens growing up into Young Adults wind up with varying number of traits depending on their aspirations as teens.
What do you expect to see? Young adults having 3 Personality traits and one Aspiration trait when growing up. (and however reward traits they may have earned).
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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1. Teens switching aspirations from a non-teen aspiration to another one when growing up will end up aspiration traits for both.

example: Teen with big happy family (Domestic) -> Angling Ace (Collector)

2. Teens with a teen aspiration trait will NOT get both traits growing up. They lose the relatable trait and only keep the one they get with the YA aspiration

example: Teen with admired icon (Relatable) -> Soulmate (Alluring). Relatable trait disappears

Teens who complete aspirations that grant reward traits get to keep them when aging up. That is ok because Reward traits are unlimited.

Young Adults, Adults and Elders don't get multiple aspiration traits when aging up. If a sim switches aspiration during the same lifetime their aspiration trait stays the same as the one picked on age-up (unless edited with cas.fulleditmode).