Electron app, after erroring and being relaunched, only partially relaunches. Why?

I have read the docs and many posts (here and elsewhere) on this subject with no joy thus far

---

It's a TypeScript Electron app built with Electron-Vite app, developed in VS Code

// package.json

"scripts": {
    "dev": "electron-vite dev -w",

It launches via its main.ts file

// main.ts

imports here...

console.log('main start');

const ipcListener = new IpcListener<IpcHandlerEvents>();
const ipcEmitter = new IpcEmitter<IpcRendererEvents>();

The main.ts file create the BrowserWindow, and with a preload file

const mainWindow = new BrowserWindow({
  show: false,
  autoHideMenuBar: true,
  webPreferences: {
    preload: join(__dirname, '../preload/preload.js'),
    sandbox: process.env.NODE_ENV !== 'test',
  },
});

And preload.ts starts similarly to main.ts

// preload.ts

imports here...

console.log('preload start');

if (process.contextIsolated) {
    try {

The main index.tsx in the renderer process then begins

// index.tsx

imports here...

console.log('index start');

Which populates content via createRoot

createRoot(document.getElementById('root') as HTMLElement).render(
  <StrictMode>
    <RouterProvider
      router={createHashRouter(getRoutesConfig(store), {
        future: {
          v7_relativeSplatPath: true,
          v7_fetcherPersist: true,
          v7_partialHydration: true,
          v7_skipActionErrorRevalidation: true,
          v7_normalizeFormMethod: true,
        },
      })}
      future={{ v7_startTransition: true }}
    />
  </StrictMode>

Finally displaying root.tsx as the, well, root of the app. With an error boundary

console.log('root start')

return (
  <ReduxProvider store={store}>
    <ErrorBoundary>
      <App />
    </ErrorBoundary>
  </ReduxProvider>
);

When an error is thrown the error boundary: stores the current state; then informs the main process

localStorage.setItem('storeToLoad', JSON.stringify(state));

window.electron.ipcRenderer.send('ERROR_IN_WINDOW', {
  error,
  errorInfo,
});

Which in turn attempts to relaunch the app after exiting

// main.ts

ipcListener.on('ERROR_IN_WINDOW', (_, args: unknown) => {
  console.log('error in window - relaunch');
  app.relaunch();
  app.exit();
});

---

So. When one first runs the app this log is shown

// in VS Code terminal
main start

// in app console
preload start
index start
root start

But once an error is thrown and the app 'relaunches` (cough) this is what is shown

// in VS Code terminal
AB C:\development\AppDir\App> (ie: the process ends) 

// in app console
preload start

And the relaunched app is just a white rectangle

Obviously this is not the desired outcome. Any ideas how I might reach the desired outcome (pls, ty)?

Thanks to this post by alex8088 I discovered that:

electron-vite is hard to intercept. It is recommended to use electron-vite preview command to test in production mode when you need to test this method.

Run electron-vite preview instead of electron-vite dev -w and app.relaunch() works fine. Or did for me anyway. Thanks Alex