When requestAnimationFrame is patched in fakeAsync the callback is not called with a timestamp like it would be expected. Instead it's called with the callback itself.

  it('should patch requestAnimationFrame correctly', fakeAsync(() => {
    requestAnimationFrame((timestamp) => {
      // Fails: Expected 'function' to be 'number'.
      expect(typeof timestamp).toBe('number');
    });
    tick(16);
  }));

I created this repo with the failing test
https://github.com/santialbo/raf-zonejs-test/blob/4491d675287b2513e39244a368877bb951b19248/src/app/app.component.spec.ts#L32-L38
It's a standard cli generated project with just the failing test