I’m currently having a similar issue at the moment (January 2022) as this from a few months ago -
I’m on E versions 3.5.3 (standard) and 3.5.2 (Pro).
I’m finding that my standard templated page hero section with a dynamic image is showing up fine, but I had an additional template for a child set of pages (Activities > Crazy Golf etc) where the header is set to Dynamic (Feature Image) but its not showing on Desktop but it is showing on mobile and tablet. I haven’t setup anything specific for the tablet/mobile breakpoints.
The only difference is some of you don’t get the image editing options in the backend but I have those.
I’ve rebuilt the page template header section from scratch again but it hasn’t fixed the issue. I can’t see anything in the Browser Inspect Tool but I could be missing something.
Caching is on, but I’ve purged all caches (including server side Vanish) and when testing I can change the overlay colour and that does appear successfully. I’ve switched all plugins on and off to check conflicts and can’t see any problems. I’ve even tried rolling back Elementor a few times to no avail.
The URL is https://wordpress-705345-2335453.cloudwaysapps.com/ and its the Activities sub pages (Crazy golf, Picnic etc) that have the issue. The other pages appear to work find with dynamic background images set to the Feature Image.
Any help to get this working would be greatly appreciated. I need to get it live for the client asap.