Using custom builder with workspace.json breaks the nx command

Current Behavior

When using @angular-builders/custom-webpack with workspace.json setup, providing builder option with @angular-builders/custom-webpack breaks the nx ... commands.

Expected Behavior

Nx command should produces same results, no matter which builder I use.

Steps to Reproduce

1. Create new Nx environment that uses workspace.json.
2. Install @nrwl/angular with @angular-builders/custom-webpack as dev-dependency.
3. Add new angular application with nx generate ....
4. Update workspace.json files as below:

...
"architect": {
    "build": {
         "builder": "@angular-builders/custom-webpack:browser",
         ...
    }
}
...

1. Save and run nx build command.

In above steps, if you change serve.builder field, instead of build.builder, it will break nx serve command.

Failure Logs

Using nx build command:

> nx run test-app:build 
Cannot determine versions of "@angular/cli".
This likely means your local installation is broken. Please reinstall your packages.

Using nx serve command:

> nx run test-app:serve 
Cannot determine versions of "@angular/cli".
This likely means your local installation is broken. Please reinstall your packages.

Additionally, using ng serve (or ng build) command:

> ng serve
The serve command requires to be run in an Angular project, but a project definition could not be found.

Environment

@nrwl/angular : 9.5.1
@nrwl/cli : 9.5.1
@nrwl/cypress : 9.5.1
@nrwl/eslint-plugin-nx : 9.5.1
@nrwl/express : Not Found
@nrwl/jest : 9.5.1
@nrwl/linter : 9.5.1
@nrwl/nest : 9.5.1
@nrwl/next : Not Found
@nrwl/node : 9.5.1
@nrwl/react : Not Found
@nrwl/schematics : Not Found
@nrwl/tao : 9.5.1
@nrwl/web : Not Found
@nrwl/workspace : 9.5.1
typescript : 3.8.3

[Splaktar]

I’m using

    "@angular-builders/custom-webpack": "^11.0.0",
    "@angular-devkit/build-angular": "0.1102.1",

In the same project with Nx 11.3.x and not seeing problems, so it looks like Nx was indeed fixed to not break in this configuration.

[brandonroberts]

Closing as resolved