HMR Angular DOM Interpolation stop working after first save

[TechGardenCode]

Which @angular/* package(s) are the source of the bug?

Don't known / other

Is this a regression?

Used to work in previous versions

Description

On a fresh Angular app (19.1.0) I created a new component with a single variable i, which is displayed in the UI along with two buttons to increment/decrement the value of i. Functionality works until the HTML file is saved at which point I am able to see a log of the variable updating, however the value is not updated in the browser

Please provide a link to a minimal reproduction of the bug

1. Generate a new component:

   ng generate component counter

2. Replace the content of the generated files with the following code:

---

counter.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'app-counter',
  templateUrl: './counter.component.html',
  styleUrls: ['./counter.component.css']
})
export class CounterComponent {
  i: number = 0; // The counter variable

  increment() {
    this.i++;
    console.log('Incremented:', this.i);
  }

  decrement() {
    this.i--;
    console.log('Decremented:', this.i);
  }
}

---

counter.component.html

<div style="text-align: center;">
  <h1>Counter Component</h1>
  <p>Current Value: {{ i }}</p>
  <button (click)="increment()">Increment</button>
  <button (click)="decrement()">Decrement</button>
</div>

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 19.1.0
Node: 22.12.0
Package Manager: npm 11.0.0
OS: darwin arm64

Angular: 19.1.0
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1901.0
@angular-devkit/build-angular   19.1.0
@angular-devkit/core            19.1.0
@angular-devkit/schematics      19.1.0
@angular/cdk                    19.0.5
@schematics/angular             19.1.0
rxjs                            7.8.1
typescript                      5.6.3
zone.js                         0.15.0

Anything else?

No response

[alan-agius4]

Transferring to the FW as this is a runtime issues.