As an update.. after rolling back to v2.21.. the same test was run – and the HTML – when sticking the element was amended from :
<header id=”masthead” class=”site-header sticky-element-original sticky-element-active element-is-not-sticky” role=”banner” style=”background-image: url(/header.jpg); “>
to :
<header id=”masthead” class=”site-header sticky-element-original element-is-sticky” role=”banner” style=”background-image: url(“/header.jpg”); position: fixed; left: 0px; top: -180px; width: 905px; margin-left: 0px; padding: 41.8868px 0px 0px; margin-top: 0px; z-index: 9999;”>
– as you can see, the background-image part has remained in place.. as does the image when viewing the page in a stuck or non-stuck phase.
Cheers.