Why is the code coverage missing for lines where inject() is used in functional ngrx effect?

I am working on an Angular project and using karma.js with jasmine to write and execute unit tests.

My problem is that if I want to unit test the functional ngrx effect without the TestBed, the coverage report reports the lines as uncovered where I inject the dependencies to my effect function.

I have created a dummy effect to demonstrate the issue.

Actions:

export const MyActions = createActionGroup({
source: 'Dummy',
events: {
'Some action': emptyProps(),
},
});


Effect:

export const dummy = createEffect(
(actions$ = inject(Actions)) =>
actions$.pipe(
ofType(MyActions.someAction),
tap(() => console.log('inject line is not covered ')),
),
{ functional: true, dispatch: false },
);


Unit test:

it('should run as an example', (done: DoneFn) => {
const actionsMock$ = of(MyActions.someAction());

dummy(actionsMock$).subscribe(() => {
expect(true).toBe(true);
done();
});
});


Coverage report as an image (shows in red that the line is not covered):



I have found that using the TestBed the mentioned issue can be avoided as stated in this github issue: https://github.com/ngrx/platform/issues/3668#issuecomment-2093221356, but I would like to keep TestBed out of unit testing the ngrx effects for simplicity.

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