Adding custom value to NextAuth session - [next-auth][error][JWT_SESSION_ERROR]

declare module "next-auth" {
  interface Session extends DefaultSession {
    user: DefaultSession["user"] & {
      id: string;
      // ...other properties
      username?: string;
      // role: UserRole;
    };
  }

  interface User extends DefaultUser {
    username?: string;
    // ...other properties
    // role: UserRole;
  }
}

callbacks: {
    session({ session, token, user }) {
      return {
        ...session,
        user: {
          ...session.user,
          id: token.sub,
          username: user.username,
        },
      };
    },
    jwt({ token, user }) {
      console.log("USER: ", user);
      return { ...token, user };
    },
  },

USER:  {
  id: ${userIdFromDb},
  email: null,
  image: null,
  username: 'newuser'
}
USER:  undefined
[next-auth][error][JWT_SESSION_ERROR]