ngx-translate/multi-http-loader version 9 works in app module but not in others

Question

I use the new release 9.0, it works perfectly in my app module

export function HttpLoaderFactory(httpBackend: HttpBackend) { return new MultiTranslateHttpLoader(httpBackend, ['/assets/i18n/core/']); }

and

TranslateModule.forRoot({ loader: { provide: TranslateLoader, useFactory: HttpLoaderFactory, deps: [HttpBackend] } })

but when declare in another module

`

export function HttpLoaderFactory(httpBackend: HttpBackend) {
  return new MultiTranslateHttpLoader(httpBackend,
    ['/assets/i18n/core/', 'assets/i18n/home/']);
}

and

TranslateModule.forChild({
      loader: {
        provide: TranslateLoader,
        useFactory: HttpLoaderFactory,
        deps: [HttpBackend]
      }
    })

It doesn't work.