Image lazy load breaks on mobile devices

I tried opting for using Autoptimize to lazy load images rather than WP Rocket; however, for some reason when viewing the site on mobile devices, the images don’t appear whatsoever. However, if I have lazy loading enabled via WP Rocket, they work just fine. The thing I don’t like about WP Rocket’s script, though, is that it’s much bigger and has a bigger impact on my PageSpeed scores when enabled.

Any ideas as to what might cause this?