OnPointerDown for iOS delayed?

I added an Event Trigger component to an object. It has two event types:

  • Pointer Down
  • Pointer Up

On Android, Pointer Down works as expected, when I put my finger on the object.
On iOS, however, Pointer Down does not fire until I left my finger, at which point both Pointer Down and Pointer Up gets triggered.

Halp.

This has been fixed in version 2017.3