The issue is still there, it's partially resolved though. From what I can tell it looks like the system runs a script to determine what the returning weight should be, displays it, then just adds 15 pounds to that. I got an event that said they lost .5 pounds but came back 15 pounds heavier. To fix it I think the easiest way would be to just fundamentally change the event if you have that trait. So the game will just pull the normal event if you don't have it, then pull the trait event if you do.