V4 NextJS SDK Does Not Return Custom Fields on User idToken

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Adding the following value for beforeSessionSaved in my options config option for the Auth0 client solved this problem in the v4 SDK for me:

import { Auth0Client, SessionData } from "@auth0/nextjs-auth0/server";

const createAuth0Client = async (brand: string): Promise<Auth0Client> => {
    const optionsConfig: Auth0ClientOptions = {
        authorizationParameters: {
            audience: 'unity',
        },
        domain:
            process.env[`${brand.toUpperCase()}_AUTH0_DOMAIN`] ||
            process.env.AUTH0_DOMAIN as string,
        clientId:
            process.env[`${brand.toUpperCase()}_AUTH0_CLIENT_ID`] ||
            process.env.AUTH0_CLIENT_ID as string,
        clientSecret:
            process.env[`${brand.toUpperCase()}_AUTH0_CLIENT_SECRET`] ||
            process.env.AUTH0_CLIENT_SECRET as string,
        appBaseUrl:
            process.env[`${brand.toUpperCase()}_APP_BASE_URL`] ||
            process.env.APP_BASE_URL as string,
        secret:
            process.env[`${brand.toUpperCase()}_AUTH0_SECRET`] ||
            process.env.AUTH0_SECRET as string,
        beforeSessionSaved: async (session: SessionData, idToken: string | null): Promise<SessionData> => ({ ...session }),
    };
    return new Auth0Client(optionsConfig)
}

export default createAuth0Client;