There is no easy/known way to fix the quest. Using a save with the quest broken and comparing it to one of my old saves at a similar spot, it may be possible to fix it by temporarily swapping a dialog file, or something. However, since this quest is rather long and different parts can be broken if things are done too much out of the expected order, a fix (if possible) for one person may not help another.
I'd have to check my old saves to see how much experience solving the To Rivertown quest gives.
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