Greetings!
After some experimenting with the feat-remove-lucia (and the hacking that followed to get it to work...)
I found out that Next.JS has deprecated / moved the useFormState.

It used to be.
import { useFormState } from "react-dom";

Now it's.
import { useActionState } from "react";

I am not too sure if Next.JS will deprecate this in the future and flat out error out but it's good idea to fix this before something happens.