If an utility node has a decision node parent, and we add a new state (new choice/decision) to the parent, it will cause the utlity table to break and not to be shown in GUI anymore.
Actually, it looks like adding states to decision node won't update the table of child node at all, because if we have a probabilistic node with a decision node as its parent, then adding a new state to decision node did not update the child's CPT.
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Actually, it looks like adding states to decision node won't update the table of child node at all, because if we have a probabilistic node with a decision node as its parent, then adding a new state to decision node did not update the child's CPT.