[RoM] Magical clones can become permanent (Patch 1.62.67)

Exactly, that's it. That's just what happens in my game

When using spellcaster's ability to duplicate themselves, cloned Sim would disappear after some time, and get removed from the family tree. 

However, this is no longer the case, they stay forever, they might leave the house but not disappear, and they stay on my Sim's family tree. This ruined my family tree and makes me not use this ability at all.

I have a sim that runs a magic school and one of her employee tasks is to cast spells. As a result of this bug, she has multiple clones that she's created all on her own. Permanently.

I had that issue too in a previous save. I've since started micro-managing my sims when they're casting spells to be sure they don't duplicate themselves. Until this issue is fixed their kids won't learn that spell when they're old enough.

I did not add the clone to the household. I believe I spent a day or so in the Magic Realm where I created the clone, traveled home, came back to the Magic Realm and my clone was still there days later interacting with other Sims.

If you add them to your household, they become permanent so just making sure that's not what you did.

The clone stays in the relationship panel — you can call them, invite them over, etc. One time, I tested it and invited them to join the household, and they joined with no issues. It happens whether you've traveled or not, even after several in-game days and lot visits. In my case, it's consistent: it doesn’t matter what you do before or after: it just happens

oscarcro97​ paalaki​ Revelation21​ 

The either of you add the clone to the household or did this just happen after travelling ?

I had this same issue. My clone existed for at least 2-3 Sim days before I deleted them from the game, as I did not want a permanent clone I can't control.