@angular-devkit/build-angular:app-shell builder produces distribution index.html missing script tags referencing the main, runtime, and polyfills chunks when the source index.html contains a self-closing <app-root /> tag

[rewento]

Command

run

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

If a self-closing tag bearing the selector of the AppComponent (<app-root />) is included in the source index.html rather than both opening and closing tags bearing that selector (<app-root></app-root>), and a distribution with an app shell is built with the ng run my-app:app-shell:production Angular CLI command, the index.html of that distribution will lack <script> tags referencing the "main", "runtime", and "polyfills" bundle chunks.

Minimal Reproduction

Reproduction Steps

1. Create a new Angular workspace with one application project with this shell command for the Angular CLI:
   new repro-app-shell-issue
   And respond like this to follow-up prompts:
   Would you like to add Angular routing? Yes
Which stylesheet format would you like to use? CSS
2. cd into the new repro-app-shell-issue directory and run this command for the Angular CLI:
   ng generate app-shell
3. Create a distribution for the app project without an app shell with the ng build repro-app-shell-issue --configuration production Angular CLI command. Examine the index.html of the distribution (dist/repro-app-shell-issue/browser/index.html) and note that it contains <script> tags referencing the "main", "runtime", and "polyfills" bundle chunks.
4. Create a distribution for the app project with an app shell with the ng run repro-app-shell-issue:app-shell:production Angular CLI command. Examine the index.html of the distribution (dist/repro-app-shell-issue/browser/index.html) and note that it contains <script> tags referencing the "main", "runtime", and "polyfills" bundle chunks.
5. Modify the source index.html (src/index.html) so that the tag bearing the selector of the AppComponent is self closing. <app-root></app-root> --> <app-root />
6. Create a distribution for the app project without an app shell with the ng build repro-app-shell-issue --configuration production Angular CLI command. Examine the index.html of the distribution (dist/repro-app-shell-issue/browser/index.html) and note that it contains <script> tags referencing the "main", "runtime", and "polyfills" bundle chunks.
7. Create a distribution for the app project with an app shell with the ng run repro-app-shell-issue:app-shell:production Angular CLI command. Examine the index.html of the distribution (dist/repro-app-shell-issue/browser/index.html) and note that it DOES NOT CONTAIN <script> tags referencing the "main", "runtime", and "polyfills" bundle chunks.

Reproduction Source Repository
https://github.com/rewento/repro-app-shell-issue/tree/main

Exception or Error

No response

Your Environment

Angular CLI: 16.2.14
Node: 18.18.2
Package Manager: npm 10.5.2
OS: darwin arm64

Angular: 16.2.12
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1602.14
@angular-devkit/build-angular   16.2.14
@angular-devkit/core            16.2.14
@angular-devkit/schematics      16.2.14
@angular/cli                    16.2.14
@schematics/angular             16.2.14
rxjs                            7.8.1
typescript                      5.1.6
zone.js                         0.13.3

Anything else relevant?

No response

[JoostK]

This is being reported as error since #27529 in upcoming v18.

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