Lazy loading not displaying the image in V5?

Questions
1

I used lasy loading in version 3 and it worked great, but now when changed to version 5 it is no longer working!?

Im using divs for background images.
<div data-background="https://domain.se/admin/user_images/images/produkt/stuff.jpg" class="moreimage lazy lazy-fade-in"> </div>

and the moreimage class looks like this.

    display:block;
	height:72px;
	width:72px;
	position:relative;
	background-repeat:no-repeat;
	background-position:center center;
	background-size:cover;

It adds the class lazy-loaded to the div as it should but it is not displaying the image?

<div class="moreimage lazy-fade-in lazy-loaded"></div>

So what could be wrong here, since its the same app and it works with v3 files!?

Thanks!