Any of the Great: (Skill) or Awful: (Skill) genes which add/remove passions respectively permanently increase/remove passions even when the xenogerm that granted them is replaced.
It's quite simple to reproduce, take any pawn without a passion and install a Xenogerm with one of the Great:(Skill) genes in it. Then replace it with a different Xenogerm, the skill offset will be updated, the passion will remain.
The inverse is also true, installing an Awful:(Skill) gene will permanently remove passions, even after the Xenogerm with that gene is replaced.
This is EXTREMELY broken as it allows players to literally staple every single passion onto a pawn. Or inadvertently permanently remove passions from pawns.
It's quite simple to reproduce, take any pawn without a passion and install a Xenogerm with one of the Great:(Skill) genes in it. Then replace it with a different Xenogerm, the skill offset will be updated, the passion will remain.
The inverse is also true, installing an Awful:(Skill) gene will permanently remove passions, even after the Xenogerm with that gene is replaced.
This is EXTREMELY broken as it allows players to literally staple every single passion onto a pawn. Or inadvertently permanently remove passions from pawns.