Deferred svelte component renders the default slot too early

Version:

@inertiajs/svelte version: 2.0.0-beta.1

Describe the problem:

There is a bug with the Deferred svelte component. It will render the components of the default slot before the props for the Svelte component have been updated. This is because the $page.props store is updated first, or at least a render happens after the store is updated but before the regular export let prop is updated.

Since the Deferred component decides what to render based on the $page store, it renders the default slot too early.

Note that passing a primitive as the deferred prop does not throw an error on the frontend, because it will just render undefined for that single render cycle. But when you pass an object as a deferred prop and try to access its properties, it throws when trying to access a property on undefined.

Steps to reproduce:

I created a repro here: https://github.com/saml-dev/inertia2-repro It includes the .env and database.sqlite to make your lives easier

clone above repo
npm i
composer install
npm run dev (and php artisan serve if not using herd/valet :D )
open the app to / and use the two links to see how one works and one doesn't

Relevant files in the code are:

Page1.svelte and Page2.svelte in resources/js/Pages
routes/web.php renders each page with the same deferred prop

inertiajs / inertia