Pagination/Next Button not behaving like expected

[frankallen]

Issue description:
I'm using mostly default css/js settings without any extras.
I've run into two small visual issues.

1. If you click through the "next" button till the end, the pagination will skip the 2nd last.
2. I'm on the first slide and click on the 2nd last item in the pagination. After that I can't click next button/the last pagination item

Demo link:
https://codepen.io/frankallen/pen/mdoWNyq

Tiny-slider version: 2.9.4
Browser name && version: Google Chrome 120.0.6099.234