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Here is how ceeding works:
Basically ceeding means the king died with no heirs, so there is a succesion crisis, and the closest relative who inherits the throne hapens to be the king of which the player ceeded to, just like happened many times in history like with Portugal in 1580.
So the unfinished regions rebel and break free to the original owners, and the rest becomes an integrated puppet first for 1 turn , then can be fully anexed (you need to share a border to anex)
