Symlink doesn't work for template and css

[Lempkin]

🐞 bug report

Affected Package

Angular 9.1.7

Is this a regression?

Yes, it used to work with angular 8

Description

I work on an application which uses some of our libraries.
I just upgraded the app and libraries from angular 8 to angular 9.
I used to use npm link to have code auto reload when I work on libraries (I create symlink from the library dist/ folder)
I used to run "ng build --watch" in library folder, and "ng serve" in the app.
When I was making changes in my library, library sources were automatically re-builded, then app's watcher detects something has changed and rebuild the app. And so I was able to immediately see my changes in navigator.

Since upgrade to angular 9, changes made in html template and css file are not shown. I have to kill the "ng serve" and relaunch it to be able to see the library changes .
What's weird is that when I made change in library, the app watcher still detects that something has changed somewhere and rebuild the app.
Also changes made in the library controller are shown immediately, only changes in html and css will not show, and needs a kill + relaunch ng serve.

I've searched in the node_module/library_folder (which is a symlink) and I do see the html/css changes in the sources.

I do have the "preserveSymlinks": true property in app's angular.json
Ivy is disabled for now.

🔬 Minimal Reproduction

https://stackblitz.com/...

🔥 Exception or Error

🌍 Your Environment

Angular Version: 9.1.7
Angular CLI: 9.1.6
Node: 13.7.0
OS: win32 x64

Angular: 9.1.7
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: No

Package Version

@angular-devkit/architect 0.901.6
@angular-devkit/build-angular 0.901.6
@angular-devkit/build-ng-packagr 0.901.6
@angular-devkit/build-optimizer 0.901.6
@angular-devkit/build-webpack 0.901.6
@angular-devkit/core 9.1.6
@angular-devkit/schematics 9.1.6
@angular/cdk 9.2.3
@angular/cli 9.1.6
@angular/flex-layout 9.0.0-beta.31
@angular/material 9.2.3
@angular/material-moment-adapter 9.2.3
@ngtools/webpack 9.1.6
@schematics/angular 9.1.6
@schematics/update 0.901.6
ng-packagr 9.0.3
rxjs 6.5.5
typescript 3.8.3
webpack 4.42.0

Anything else relevant?

[alan-agius4]

Duplicate of #13588

This happens when you build the application in AOT and using the old deprecated rendering engine (VE).

The fix for this is to either use Ivy or disable AOT during development.

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