svelteKit: getToken return null

Environment

System:
OS: macOS 12.6
CPU: (48) x64 Intel(R) Xeon(R) W-3265M CPU @ 2.70GHz
Memory: 107.02 GB / 192.00 GB
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 16.16.0 - /usr/local/bin/node
npm: 8.11.0 - /usr/local/bin/npm
Browsers:
Chrome: 109.0.5414.87
Firefox Developer Edition: 110.0
Safari: 16.0

Reproduction URL

https://github.com/rolanday/skit-authjs

Describe the issue

getToken returns null

https://github.com/rolanday/skit-authjs/blob/main/src/routes/api/%2Bserver.ts

import type { RequestHandler } from '@sveltejs/kit';
import { getToken } from '@auth/core/jwt';
export const GET: RequestHandler = async ({ request }) => {
	const jwt = await getToken({ req: request, secret: 's3cr3t' });
	return new Response(String(jwt));
};

How to reproduce

Code minor fork off official next-auth from here:
https://github.com/nextauthjs/next-auth/tree/main/apps/examples/sveltekit

Use sample to sign-in, and verify JWT token is present (it is). Then make API call to http://localhost:5173/api using from same browser as signed in. getToken return nujl.

import type { RequestHandler } from '@sveltejs/kit';
import { getToken } from '@auth/core/jwt';
export const GET: RequestHandler = async ({ request }) => {
	const jwt = await getToken({ req: request, secret: 's3cr3t' }); // <<======
	return new Response(String(jwt));
};

Expected behavior

Expect to get back unencrypted token (same behavior as get making getToken call from Nex.js).

Start with src/routes/api/+server.ts and reproduce the request using the linked SvelteKit example and the provided getToken call. Compare the SvelteKit request handling with the Next.js usage, then verify that the API response returns the unencrypted token rather than null.