🐞 bug report

Affected Package

Is this a regression?

Description

I am working with dynamic views and decided to add an embeddedViewRef.detectChanges() call in my app which unexpectedly spit out the following error:

core.js:4197 ERROR TypeError: Cannot read property '5' of null at updateTransplantedViewCount (core.js:2425) at refreshView (core.js:7268) at detectChangesInternal (core.js:8506) at ViewRef.detectChanges (core.js:9864)

This error is occurring in the first line of the updateTransplantedViewCount function:

due to the LContainer input variable being null.

And updateTransplantedViewCount is being called inside refreshView here:

...so lView[PARENT] here is resolving to null.

The obvious first reaction is "well, let's add a null check to one of these functions"...but I'm not familiar enough with the Ivy internals to know if lView[PARENT] being null alongside LViewFlags.RefreshTransplantedView being set represents some larger architecture issue (i.e. this scenario should be "impossible").

For a little more context, I am calling embeddedViewRef.detectChanges() on a non-destroyed embedded view ref that is not attached to a view container ref (was previously attached, but had been detached).

🔬 Minimal Reproduction

🌍 Your Environment

Angular Version:

Angular CLI: 10.0.8
Node: 14.8.0
OS: win32 x64

Angular: 10.0.14
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
Ivy Workspace: Yes

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.1000.8
@angular-devkit/build-angular      0.1000.8
@angular-devkit/build-ng-packagr   0.1000.8
@angular-devkit/build-optimizer    0.1000.8
@angular-devkit/build-webpack      0.1000.8
@angular-devkit/core               10.0.8
@angular-devkit/schematics         10.0.8
@angular/cli                       10.0.8
@ngtools/webpack                   10.0.8
@schematics/angular                10.0.8
@schematics/update                 0.1000.8
ng-packagr                         10.1.0
rxjs                               6.5.5
typescript                         3.9.7
webpack                            4.43.0