🐞 bug report

Affected Package

Is this a regression?

Description

Problem: ComponentRef.onDestroyed callback does not get called

A component gets dynamically created via ComponentFactoryResolver. It is then inserted into the view.

@ViewChild("anchor", { read: ViewContainerRef })
anchor: ViewContainerRef;

this.compRef = this.cfr
    .resolveComponentFactory(DynamicComponent)
    .create(this.injector);

this.compRef.onDestroy(() =>
    console.log("DynamicComponent onDestroyed callback")
);

this.anchor.insert(this.compRef.hostView);

As you can see, the onDestroyed callback is attached. If the component gets destroyed by its ComponentRef, the callback gets called correctly like so:

this.compRef.destroy();

if the component gets destroyed by clearing the anchor, the callback does not get called:

this.anchor.clear();

As far as I can tell, the onDestroyed callback ONLY gets called when the component gets destroyed by its ComponentRef. Whenever the component gets destroyed by clearing parent views or navigating away or data binding, the callback does not get called.

It works in NG 8.2.14 and it works if you set enableIvy: false in tsconfig.json.

🔬 Minimal Reproduction

https://stackblitz.com/edit/angular-ivy-ev4v2y

🌍 Your Environment

Angular Version:

Angular CLI: 10.1.6
Node: 12.18.1
OS: win32 x64

Angular: 10.1.5
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-webworker, router
Ivy Workspace: No

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1001.6
@angular-devkit/build-angular   0.1001.6
@angular-devkit/core            10.1.6
@angular-devkit/schematics      10.1.6
@angular/cdk                    10.2.4
@angular/cli                    10.1.6
@angular/material               10.2.4
@schematics/angular             10.1.6
@schematics/update              0.1001.6
rxjs                            6.6.3
typescript                      4.0.3