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

compiler, core

Is this a regression?

Yes

Description

This code:

import {
  EnvironmentInjector,
  inject,
  Component,
  runInInjectionContext,
} from '@angular/core';

@Component({
  selector: 'app-root',
  template: `
    Welcome to Angular!
  `,
})
export class App {
  private readonly _injector: EnvironmentInjector = inject(EnvironmentInjector);

  constructor() {
    console.log('app start');

    setTimeout(async () => {
      try {
        return runInInjectionContext(this._injector, async () => {
          throw new Error('error');
        });
      } catch (e) {
        console.log('in Catch');
      }
    }, 200);
  }
}

in angular 20 this will trigger the angular error handler. In previous versions this did not happen.
The consequence of this is that you cannot choose to handle errors anymore that happen inside of the runInInjectionContext without that it triggers the error handler.
without

Please provide a link to a minimal reproduction of the bug

No response

Please provide the exception or error you saw

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

Anything else?

No response