Jest running multiple times in monorepo

[vscaiceanu-1a]

Describe the Bug

When running jest in a monorepo with 2 projects, all tests are executed twice.

If a 3rd item is added to the projects array in jest.config.js, the tests run 3 times.

Minimal Reproduction

You can use https://github.com/vscaiceanu-1a/ng-monorepo-jest to reproduce the problem.

Setup npm install.

Then npm run ng test webapp.

 PASS   webapp  projects/webapp/src/app/app.component.spec.ts
 PASS   webapp  projects/webapp/src/app/app.component.spec.ts

Test Suites: 2 passed, 2 total
Tests:       6 passed, 6 total
Snapshots:   0 total
Time:        1.078 s
Ran all test suites in 2 projects.

Expected Behavior

Project tests are executed once.

Environment

Libs
- @angular/core version: ^19.1.0
- @angular-devkit/build-angular version: ^19.2.6
- @angular-builders/jest version: ~19.0.0

For Tooling issues:
- Node version: v20.11.1
- Platform:  Mac

Thank you