I've had this bug for a while in my main game, so I made a quick test in a fresh game..
Game Version: 1.60.54.1020 (PC/English)
Expansion/game/stuff packs: Seasons, Discover University, Parenthood, Outdoor Retreat, Vintage Glamour Stuff, Backyard Stuff, Movie Hangout Stuff
No mods/CC
I went with Romantic, Active, and Hot-Headed, as they seemed to produce negative moodlets fairly often.
My first test (copying a sim before I played her), didn't produce results. I played the original and the copy for about a sim-day - she got angry and tense half a dozen times; he (I changed the gender so I could tell them apart) had no problems. Then I cloned the day-old family, changed her traits too, and moved them into a different lot (I did use freerealestate because they were broke). I played them for a couple of sim-days, and she got tense from Active (which she no longer has).
Save file is at https://drive.google.com/open?id=1nDQ6ui-NBX_i_t3hyXhpu4UKVBdNK7yp - the original family is in Brightchester; the "shouldn't get tense" ones are in Willow Creek (I forgot I should've changed their names).
@crinrict That thread seems to be mostly triggered by the soccer ball though. My sim has never used a soccer ball (or done a push-up). I hadn't been playing the test one very long, so the Active tense moodlet was the only one I'd seen so far, but in my main save, it was a formerly non-committal sim who got tense from her job (I edited her when she got married). It doesn't seem to be triggered by any specific action for me - it's come up while she's at work a couple of times, as well as just hanging around at home (drinking water, watching TV).
I added a new sim to the test - gave him Non-Commital, Romantic, and Angry. Played him a few days, then saved him, deleted the original, loaded him from the library into a new household in CAS, changed his traits, and moved him back into the house. The next day...
The other sim (and this one, in one day so far) hasn't gotten tense from the former Romantic trait - but Active and Non-Committal both definitely still stick around after being changed. I'm not using cheats or anything - just tweaking library sims in CAS before putting them in the world. It only happens with sims that have been previously played, before being saved to the library.
I eventually used a cheat to give him enough satisfaction points for retraiting potions - he had to take two, one to add the trait, then another to remove it (properly). He's gone about a week without being tense (from Non-Commital anyway). So I guess this is a low-priority issue now.
@crinrict I changed the traits in CAS after loading a sim from the library. I did not use cheats in CAS - the traits were freely editable at that point (before placing the sim in the world). I did use freerealestate because my test sims were broke and homeless. After the bug showed up, I used sims.give_satisfaction_points to test the retraiting potion to fix it.
