🐞 bug report

Affected Package

@angular/upgrade

Is this a regression?

No, afaik.

Description

When using UpgradeModule.bootstrap() to run AngularJS/Angular apps in hybrid mode, changes to the app after starting the devserver using ng server --hmr result in this error:

Error: [ng:btstrpd] App already bootstrapped with this element

🔬 Minimal Reproduction

https://stackblitz.com/edit/angular-5qna3t?file=src/app/app.module.ajs.ts
Changing the template in the file above will throw an error in console.

🔥 Exception or Error

Error: [ng:btstrpd] App already bootstrapped with this element

🌍 Your Environment

Angular Version:

11.0.2

Anything else relevant?