Single Bundle Build for mono repo not working

[sidram01]

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

@angular-devkit/build-angular used to create a single bundle build for my web element build on angular 20
as a standalone app the single bundle build is working , but when migrated as part of a mono repo the single bundle build is not working

Minimal Reproduction

"elem:build": "ng build APP_NAME  --single-bundle true" 

i had to add a concat js to create single bundle
"build:bundle": "npm run build:prod:APP_NAME && node scripts/concat-bundle.js",

Exception or Error

Your Environment

Angular CLI: 20.0.5
Node: 22.14.0
Package Manager: yarn 1.22.22
OS: darwin arm64

Angular: 20.0.6
... common, compiler, compiler-cli, core, elements, forms
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.2000.5
@angular-devkit/build-angular   20.0.5
@angular-devkit/core            20.0.5
@angular-devkit/schematics      20.0.5
@angular/build                  20.0.5
@angular/cli                    20.0.5
@schematics/angular             20.0.5
rxjs                            7.8.2
typescript                      5.8.3
zone.js                         0.15.1

Anything else relevant?

No response

[alan-agius4]

The Angular CLI never supported a single bundle output.

See: #26478