slick slides to scroll not working when last slide has single item

[Prasanna-naik-97]

short description of the bug / issue, provide more detail below.

1. Total slides 9
2. slidestoshow 5
3. slidestoscroll 4

I have total of 9 slides and I would like to scroll 4 items on click of arrows. Slides to show should be 5.
When you execute below code, you see on last slide when we click on arrow it's not scrolling.

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Code sandbox below. Please open the view in new window.
https://codesandbox.io/s/nostalgic-almeida-kn98f6?file=/index.js