Last picture on page do not loading (lazy loading)

[Bammede]

Issue description:

Horizontal slider. Last picture lazy load too late. After opening the page, the last picture not loading even the container is visible. After moving the picture, lazy loading runs and picture is displayed.

Demo link/slider setting:

var slider = tns({
            container: '.slider',
            items: 1,
            slideBy: '1',
            prevButton: '.prev',
            nextButton: '.next',
            nav: false,
            mouseDrag: true,
            lazyload: true,

Tiny-slider version: current
Browser name && version: Brave
OS name && version: Windows