SSR disabled incorrectly handles root layout exceptions

[WarningImHack3r]

Describe the bug

Disabling SSR while throwing an error from the root +layout.js causes this very exception to not get caught properly by the error.html file, despite the docs pages or the tutorial not stating anything about this case.

Reproduction

https://stackblitz.com/edit/sveltejs-kit-template-default-4piamvj6?file=src%2Froutes%2F%2Blayout.ts

Logs

System Info

Stackblitz

Severity

annoyance

Additional Information

No response