isr: NG0500: During hydration Angular expected <div> but found <button>

[timsar2]

Description

By creating a new angular project I just add a button in appcomponent.html under the main tag and I got this error During the watch mode:

npm run watch

node .\dist\isr\server\server.mjs --watch

Error: NG0500: During hydration Angular expected <div> but found <button>.

Angular expected this DOM:

<main _ngcontent-ng-c4078563999="" class="main">
  …
  <router-outlet>…</router-outlet>
  <div>…</div>  <-- AT THIS LOCATION
  …
</main>

server.ts:

const isr = new ISRHandler({
    indexHtml,
    invalidateSecretToken: process.env['INVALIDATE_TOKEN'] || 'MY_TOKEN', // replace with env secret key ex. process.env.REVALIDATE_SECRET_TOKEN
    enableLogging: !environment.production,
    serverDistFolder,
    browserDistFolder,
    bootstrap,
    commonEngine
  });

"@rx-angular/isr": "^17.1.0"