[CLI][Schematics] Override Angular Schematics issue - Collection "[Schematics folder path]" cannot be resolved. - Windows

[SlawomiKussowski]

Command

generate

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

Unknown

Description

This is similar issue to #29559.
The behavior has been fixed but only in ng generate command is executed in the root folder.

If you try to override standard Angular Schematics with a custom one by the use of schematicCollections option in angular.json file like for instance:

 "cli": { "analytics": false, 
"schematicCollections": [
   "./schematics", 
  "@schematics/angular" ]
 }

And create your custom schematics (index.ts):

import {
  externalSchematic,
  Rule,
  SchematicContext,
  Tree
} from '@angular-devkit/schematics';
import { Schema as ComponentOptions } from '@schematics/angular/component/schema';

export function generateComponent(options: ComponentOptions): Rule {
  console.log('options', structuredClone(options));
  return (_tree: Tree, _context: SchematicContext) => {
    return externalSchematic(
      "@schematics/angular",
      "component",
      options
    );
  };
}

And then go to any subfolder.
It will end up with an error message like this one:
Collection "D:\projects\schematics-test_v19\src\app\schematics" cannot be resolved.

Please use the attached repo to reproduce the issue:

schematics-test_v19.zip

Minimal Reproduction

Run npm install and then go to a subfolder, for instance:
cd .\src\app
and try to generate a component using:
ng g c
command.

Exception or Error

Collection "D:\\projects\\schematics-test_v19\\src\\app\\schematics" cannot be resolved.

Your Environment

Angular CLI: 19.2.5
Node: 22.13.0
Package Manager: npm 8.6.0
OS: win32 x64

Angular: 19.2.4
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1902.5
@angular-devkit/build-angular   19.2.5
@angular-devkit/core            19.2.5
@angular-devkit/schematics      19.2.5
@angular/cli                    19.2.5
@schematics/angular             19.2.5
rxjs                            7.8.1
typescript                      5.7.3
zone.js                         0.15.0

Anything else relevant?

This is similar issue to #29559.