Situation: trying to pick AI core out of the 10x colony just to put her to govern a 3x colony. The core already left the vault and refuse to come back (alpha core event)
> cut the connection between the old core and the colony.
> after that, put another alpha core in so it can continue to govern previous planet.
> try to pick the "new" AI core out of administration just after that.
> the core "disappeared" from the vault RIGHT AFTER you put it in.
> It refuse to come back, as usual, and act like the old core.
In conclusion: the "new" AI core act just like the old, and is immersion breaking. This should not happen when the replaced core is entirely new.