Manual Cache Update | Dispatch function is not firing - reactjs

Question

I have the following API slice:
const mainApi = createApi({
reducerPath: 'mainApi',
baseQuery: fetchBaseQuery({
baseUrl: 'http://localhost:3001/api/v1',
}),
tagTypes: ['$USER'],
endpoints: (builder) => ({
login: builder.mutation({
query: ({ email, password }) => ({
url: '/auth/login',
method: 'POST',
body: {
email,
password,
},
credentials: 'include',
}),
transformResponse: (res) => res.data,
// invalidatesTags: ['$USER'],
async onQueryStarted(payload, { dispatch, queryFulfilled }) {
console.log('LOGIN QUERY STARTED');
try {
const { data: $USER } = await queryFulfilled;
dispatch(
mainApi.util.updateQueryData('getLoggedInUser', null, (draft) => {
console.log('METHOD DISPATCH RAN!!');
Object.assign(draft, $USER);
})
);
} catch (err) {}
},
}),
getLoggedInUser: builder.query({
query: () => ({
url: '/auth/logged-in-user',
credentials: 'include',
}),
transformResponse: (res) => res.data,
providesTags: ['$USER'],
}),
}),
});
and I have the following component which uses this API slice:
login.js
export default function Login() {
const navigate = useNavigate()
const [login, { isError, isSuccess, isLoading, error, data }] = useLoginMutation()
useEffect(() => {
switch (true) {
case isError:
console.log("ERROR!")
break
case isSuccess:
console.log('SUCCESSFULY LOGGED IN!, userdata:', data)
navigate('/', { replace: true })
}
}, [isError, isSuccess])
const formSubmit = (e) => {
e.preventDefault()
const formData = new FormData(e.target)
const email = formData.get('email')
const password = formData.get('password')
login({ email, password })
}
return (
<form onSubmit={formSubmit}>
<TextField name="email" type="email" required />
<TextField name="password" type="password" required />
<button type="subbmit">LOGIN</button>
</form>
)
}
when I input the email and the password on the front-end and click LOGIN I can successfully log in.
but it prints the following in the console:
LOGIN QUERY STARTED
SUCCESSFULY LOGGED IN!
but it does not print METHOD DISPATCH RAN!! which is causing other things in my app to fail, can you help me?