Angular 20: --findRelatedTests doesn't work

[marapper]

Describe the Bug

Comma-separated --find-related-tests does not transform to space separated --findRelatedTests as expected by Jesthttps://jestjs.io/docs/cli#--findrelatedtests-spaceseparatedlistofsourcefiles

Minimal Reproduction

$ ng test --find-related-tests file1,file2

Execute jest with the following arg:

'--findRelatedTests',
  'file1,file2',

If --show-config used, there is same issue is show in a config:

"testPathPatterns": [
      "src/app/components/form-fields/shared/fields.validators.ts,src/app/components/dib-input-select/dib-input-select.component2.ts"
    ],

Jest returns an error after line

Pattern: file1,file2 - 0 matches

Jest uses nonFlagArray to collect all files from CLI run.

Expected Behavior

Specific file paths should be passed correctly to Jest and be ignored if one of the paths doesn't exist

Environment

Libs
- @angular/core version: X.Y.Z
- @angular-builders/jest version: ~21.0.0

For Tooling issues:
- Node version: 24
- Platform:  Mac