If Prea Slarth is talked to before A Grim Undertaking she will get an affinity link Thea, but for some reason once said mission is completed and Thea changes her last name that link disappears. If Prea is spoken to at this point the missing link will be replaced by a new one.
What the Affinity Chart could look like before A Grim Undertaking.
What the same Affinity Chart looked like after A Grim Undertaking.
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