`preact build` hanging after seemingly successful build when using react-query

[kapnoc]

• Check if updating to the latest Preact version resolves the issue

Describe the bug
When using react-query's useQuery, building with prerender (default) makes preact build hang indefinitely, after a seemingly successful build (no error message, and normal looking list of created files):

 Build  [======] 95% (1.6s) emitting
                 bundle.7e56a.css ⏤  445 B
              bundle.*****.esm.js ⏤  20.8 kB
           polyfills.*****.esm.js ⏤  2.18 kB
       route-home.chunk.e6c71.css ⏤  74 B
    route-home.chunk.*****.esm.js ⏤  288 B
    route-profile.chunk.62c75.css ⏤  77 B
 route-profile.chunk.*****.esm.js ⏤  469 B
        route-home.chunk.723ad.js ⏤  291 B
                       index.html ⏤  1.24 kB
                         200.html ⏤  829 B
               polyfills.3cf93.js ⏤  2.17 kB
     route-profile.chunk.8b71c.js ⏤  486 B
                  bundle.73fb3.js ⏤  20.8 kB

This doesn't hang, and does exit normally when using preact build --no-prerender
There is also no problems running this with preact watch

To Reproduce

Steps to reproduce the behavior:

1. Create default app with preact create
2. Add react-query dep, in my case: "react-query": "^3.15.2"
3. Change src/components/app.js to :

import { h } from 'preact';
import { Router } from 'preact-router';
import { QueryClient, QueryClientProvider, useQuery } from 'react-query'

import Header from './header';

// Code-splitting is automated for `routes` directory
import Home from '../routes/home';
import Profile from '../routes/profile';

export const queryClient = new QueryClient()

const TestElement = () => {
	const { data, isLoading } = useQuery('test', () => 'test1')
	if (isLoading) {
		return (<span>Loading...</span>)
	}

	return (<span>{data}</span>)
}

const App = () => (
	<div id="app">
		<QueryClientProvider client={queryClient}>
			<Header />
			<TestElement />
			<Router>
				<Home path="/" />
				<Profile path="/profile/" user="me" />
				<Profile path="/profile/:user" />
			</Router>
		</QueryClientProvider>
	</div>
)

export default App;

4. Run preact build

Expected behavior
I would expect the build to exit after the files are built. In that test case, useQuery should receive instantly resolving test data, so I don't see the hang coming from "trying to get data to render".

This could of course be expected behaviour that I am not aware of, which I guess could be documented somewhere.