afterChange doesn't fire with lazyLoading: 'ondemand'

CodeSandBox: https://codesandbox.io/s/react-typescript-sq6ih

When i'm using **lazyLoading** option with **'ondemand'** value, _afterChange_ function doesn't fire. It's easy to reproduce by fast clicking on the "next arrow". But if all images already loaded bug will not reproduce (for example if u will press prev arrow).

Steps to reproduce:
1. After render page, just press on next arrow fast
2. You will see, that _beforeChange_ fires every time, but _afterChange_ sometimes doesn't fire
3. Watch on the console

Even if u already scrolled to last slide, _afterChange_ could still doesn't fire, looks like a bug..


p.s. sry for my eng.