Responsive background images don't lazy load on mobile

[sanjaypanikkar]

Prerequisites

• [x] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• [x] The issue still exists against the latest stable version of Elementor.

Description

Responsive image backgrounds that are below the fold (off-screen) don't lazy load on mobile. (However, this seems to be working correctly on desktop.)

Steps to reproduce

• Add a section below the fold.
• Set a background image for the section, one for desktop, and a different one for mobile.
• Check with Google PageSpeed to see if it throws a "Defer off-screen images" recommendation for mobile.

Isolating the problem

• [x] This bug happens with only Elementor plugin active (and Elementor Pro).
• [x] This bug happens with a default WordPress theme active.
• [x] I can reproduce this bug consistently using the steps above.

Environment

System Info

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[jivaneo]

Up, important feature! Waiting for solution too.