Thanks for your replies and concerns, really. I found a workaround, that is not a workaround, actually. I used the Larian teleport system. Define a on use teleport interactable item, put a teleport trigger, link both, and it works. Took me 5 minutes for it to work, and hours with "my" system, not working. This is the issue of having some modding experience, and trying to reproduce old behaviours.
Cheers.