Error building localized app with webpack when subPath option is used

[frederic-septeo]

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

No response

Description

When I build a localized angular application with the "@angular-devkit/build-angular:browser" builder and a subPath configured I get the following error :
Localized bundle generation failed: ENOENT: no such file or directory, open 'C:\......\newAngular\dist\new-angular\en-US\polyfills.7758a3fdbccf54e6.js'

The error occurs with a newly generated angular app and only with a webpack builder. The esbuild builder works fine.

Here is the full angular.json :

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "newAngular": {
      "projectType": "application",
      "schematics": {},
      "root": "",
      "sourceRoot": "src",
      "prefix": "app",
      "i18n": {
        "sourceLocale": {
          "code": "en-US",
          "subPath": ""
        },
        "locales": {}
      },
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/new-angular",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": [
              "zone.js",
              "@angular/localize/init"
            ],
            "tsConfig": "tsconfig.app.json",
            "assets": [
              {
                "glob": "**/*",
                "input": "public"
              }
            ],
            "styles": [
              "src/styles.css"
            ],
            "scripts": [],
            "localize": true
          },
          "configurations": {
            "production": {
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "500kB",
                  "maximumError": "1MB"
                },
                {
                  "type": "anyComponentStyle",
                  "maximumWarning": "4kB",
                  "maximumError": "8kB"
                }
              ],
              "outputHashing": "all"
            },
            "development": {
              "optimization": false,
              "extractLicenses": false,
              "sourceMap": true
            }
          },
          "defaultConfiguration": "production"
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "configurations": {
            "production": {
              "buildTarget": "newAngular:build:production"
            },
            "development": {
              "buildTarget": "newAngular:build:development"
            }
          },
          "defaultConfiguration": "development"
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n"
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "polyfills": [
              "zone.js",
              "zone.js/testing",
              "@angular/localize/init"
            ],
            "tsConfig": "tsconfig.spec.json",
            "assets": [
              {
                "glob": "**/*",
                "input": "public"
              }
            ],
            "styles": [
              "src/styles.css"
            ],
            "scripts": []
          }
        }
      }
    }
  }
}

Minimal Reproduction

Create an empty angular application with ng new.
Set builder to @angular-devkit/build-angular:browser
Add localization package with ng add @angular/localize
Add i18n config in angular.json using the subPath option.
Launch build with ng build

Exception or Error

Localized bundle generation failed: ENOENT: no such file or directory, open 'C:\......\newAngular\dist\new-angular\en-US\polyfills.7758a3fdbccf54e6.js'

Your Environment

Angular CLI: 19.2.10
Node: 20.11.0
Package Manager: npm 10.2.4
OS: win32 x64

Angular: 19.2.9
... common, compiler, compiler-cli, core, forms, localize
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1902.10
@angular-devkit/build-angular   19.2.10
@angular-devkit/core            19.2.10
@angular-devkit/schematics      19.2.10
@angular/cli                    19.2.10
@schematics/angular             19.2.10
rxjs                            7.8.2
typescript                      5.7.3
zone.js                         0.15.0

Anything else relevant?

No response