2 instances of this:
There was an Angelic toddler who I used cas.fulleditmode to change into another trait, but she still received some moodlets “From Being Angelic” like the random happy moodlet with the angel wings icon throughout the rest of her age span.
There was an Independent toddler who I had created, played with, and saved in the gallery. I started a new game and used his played household from the gallery as the one I wanted to play with in this new save, but I changed his trait to Fussy before continuing to the next screen. During gameplay, he still received the Independent trait’s positive moodlets from being left alone.
Edit By crinrict: Adjusted Title to fit old bug report.