Cannot set properties of null (setting '__h') error when suspending the entire app

[theninthsky]

Preact version: 10.10.0 (happens in earlier versions aswell).

Bug Description

When wrapping the entire <App> with Suspense, I get the following error:

Uncaught TypeError: Cannot set properties of null (setting '__h')
    at M

And the app breaks after navigating to another page (it becomes unresponsive).

This does not happen if I only wrap the <Routes> component with Suspense.

To Reproduce

1. Clone my repo: https://github.com/theninthsky/client-side-rendering/tree/preact.
2. Execute npm i and npm start.
3. Refresh the page a few times until this error shows (it's inconsistent, as if it depends on script loading times or something).

You can even visit the preview deploy here: https://70f42741.client-side-rendering.pages.dev

Expected behavior
No error should be thrown and the app should be responsive.

I'd like to add that I really love Preact and its great compatibility with React codebase, and that the ability to suspend the entire app is very important to me (in order to prevent when I call Sequenced Rendering).

[theninthsky]

@JoviDeCroock
Thanks for the very quick fix!
However, I now get another error, will be opening a new issue soon.

[JoviDeCroock]

Heh, I even thought about you when making #3645 but then completely forgot to guard for that