platform is undefined in the load function.

[botofune]

Hi.
I'm using Sveltekit 1.24.0.
https://developers.cloudflare.com/d1/examples/d1-and-sveltekit
Referring to the above page, I set the following values for Platform in app.d.ts, but when I check platform in the load function, it is undefined.

// app.d.ts

// See https://kit.svelte.dev/docs/types#app
// for information about these interfaces
declare global {
	namespace App {
		// interface Error {}
		// interface Locals {}
		// interface PageData {}
		interface Platform {
			env: {
				DB: D1Database;
			};
			context: {
				// eslint-disable-next-line @typescript-eslint/no-explicit-any
				waitUntil(promise: Promise<any>): void;
			};
			caches: CacheStorage & { default: Cache };
		}
	}
}

export {};

// page.server.ts

export async function load({ platform }) {
  console.log(platform); // undefined
}

What could cause the platform to be undefined?