Layout data is cleared when url is used in +layout.ts

[alialaa]

Describe the bug

I was having some simple redirect logic in my application in +layout.ts:

export const load = async ({ data, url }) => {
	const { user } = data || {};
	if (user && url.pathname === '/login') {
		throw redirect(302, '/');
	}
	if (!user && url.pathname !== '/login') {
		throw redirect(302, '/login');
	}
	return {
		user
	};
};

After updating to @sveltejs/[email protected], the app was fully reloading when navigating instead of client side routing. After some investigation I found out that using url in +layout causes the data passed from +layout.server to be cleared.

In the example below I am just logging url.pathname in +layout and displaying the data in the Home page. When navigating from and the back to the home page; the data is cleared. That won't happen if console.log(url.pathname) is removed from +layout.

Reproduction

https://stackblitz.com/edit/sveltejs-kit-template-default-bdr4bj?file=src/routes/+layout.js

Logs

No response

System Info

System:
    OS: macOS 12.1
    CPU: (8) arm64 Apple M1
    Memory: 1.63 GB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.16.0 - /usr/local/bin/node
    Yarn: 1.22.11 - ~/.npm-global/bin/yarn
    npm: 8.11.0 - /usr/local/bin/npm
    Watchman: 2022.03.21.00 - /opt/homebrew/bin/watchman
  Browsers:
    Chrome: 104.0.5112.101
    Safari: 15.2
  npmPackages:
    @sveltejs/adapter-auto: next => 1.0.0-next.66 
    @sveltejs/kit: ^1.0.0-next.423 => 1.0.0-next.444 
    svelte: ^3.44.0 => 3.49.0 
    vite: ^3.0.0 => 3.0.9

Severity

blocking an upgrade

Additional Information

No response

[alialaa]

I believe this issue still exists in 1.0.0-next.446. I updated the demo above with 1.0.0-next.446 and the data is still being cleared.