Wrong path to prerendered html page with APP_BASE_HREF set

[json-derulo]

Command

build

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

v18

Description

In an Angular 19 SSR + i18n project, I am setting a base href in my app config:

{
    provide: APP_BASE_HREF,
    useValue: '/'
  }

However, in the path to my prerendered html page parts are being removed.

Minimal Reproduction

Repro: https://github.com/json-derulo/ng19-prerendering-path-issue-repro

• Generate a fresh Angular 19 project
• Add i18n
• Add the above snippet to the app config
• Add routing
• Build the project with ng build

Exception or Error

There is no error. However on prerender during the build, parts from the router paths are being removed. For example, I have defined speakers/xyz in my router. But the path to the respective html file in the dist folder is like the following: en-US/ers/xyz/index.html. Expected behavior would be en-US/speakers/xyz/index.html.

Your Environment

Angular CLI: 19.0.0-rc.0
Node: 22.11.0
Package Manager: npm 10.9.0
OS: darwin x64

Angular: 19.0.0-rc.0
... animations, cli, common, compiler, compiler-cli, core, forms
... localize, platform-browser, platform-browser-dynamic
... platform-server, router, ssr

Package Version

@angular-devkit/architect 0.1900.0-rc.0
@angular-devkit/build-angular 19.0.0-rc.0
@angular-devkit/core 19.0.0-rc.0 (cli-only)
@angular-devkit/schematics 19.0.0-rc.0
@schematics/angular 19.0.0-rc.0
rxjs 7.8.1
typescript 5.5.4
zone.js 0.15.0

Anything else relevant?

In Angular v18 the issue is not reproducible.