You can hover on the small 🖼️ on the description to show the $meta.image, but yeah. On the remix of generators that I made, you can hover directly on the image to show the $meta.image.
I see... Honestly I don't know why anyone would ever want the auto-generated image to take precedence if they've chosen to set a specific thumbnail image for the site explicitly. I don't know what the logic is behind not showing the explicitly-set image as priority.
Ah I see. Yeah, I guess I'd just suggest to at least flip them around. So the shown image is the image, and the hovered emoji is the screenshot version.