Yes. New game. Male is the first Sim the game generated upon opening CAS. Female is randomly generated Sim.
Played around with body details on the male. Deleted details and re-added. Only the necklace changed the shirt's state of "tucking."
Played around with bottoms for the female. Shirt stayed tucked.
Wonder if that has anything to do with it. Maybe the random templates are bugged still. Like when you first open CAS to generate a Sim, you get one of few Sims.
After many tries I got the first one you posted but he also looks fine for me.
Now I'm curious. Here's a link to my save: https://drive.google.com/file/d/1aNqKBBj21F3G0wPzsq1LPwNcvNG948KW/view?usp=sharing
Finally got that one. Also looks fine. Checking your save but when I tried an already bugged Sim, it wouldn't go back to normal for me either.
I'm wondering if the shirt was based on a female shirt. It certainly seems to look better on female Sims. Not sure what effect that would have.
Your save
Huh. 🤷♀️
